Evaluation of Collections on Nursing

Education and Research

Andrea Goldstein

Info 667

2/16/2011

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Table of Contents

Introduction…………………………..……………………………………………………………2

Brief Test Summary

Raw Scores………………………………………………………………………………...2

Brief Test Results………………………………………………………………………….2

Brief Test Detailed Results

Level 1 – Minimal…………………………………………………………………………3

Level 2 – Basic…………………………………………………………………………….4

Level 3 – Instructional…………………………………………………………………….5

Level 4 – Research………………………………………………………………………...6

Brief Test Titles and Counts………………………………………………………………………7

Coverage Power Test Summary………………………………………………………………….10

Coverage Power Test Details…………………………………………………………………….11

Comparison of Brief Test and Coverage Power Test……………………………………………12

WorldCat Collection Analysis

Related Authors………………………………………………………………………….12

Related Subjects………………………………………………………………………….13

Languages………………………………………………………………………………..13

Publish or Perish Journal Impact Analysis………………………………………………………14

Audience Levels Analysis……………………………………………………………………….14

Web of Science Journal Analysis

Top Authors……………………………………………………………………………..15

Top Institutions………………………………………………………………………….15

Top Titles………………………………………………………………………………..16

Literature by Publication Year…………………………………………………………..16

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Introduction

This project analyzes the literature in the field of nursing. Specifically, it looks at materials on

the subject of Nursing – Education and Research, corresponding to the Library of Congress

classes RT71-RT81.5.

To find materials within this class range in WorldCat, the following search strategy was used:

lc: RT71 OR lc: RT72 OR lc: RT73 OR lc: RT73.5 OR lc: RT73.7 OR lc: RT74 OR lc: RT74.5

OR lc: RT74.7 OR lc: RT75 OR lc: RT76 OR lc: RT77 OR lc: RT78 OR lc: RT79 OR lc: RT80

OR lc: RT81 OR lc: RT81.5 and cg: 07 and ((dt= “bks”) or (dt= “ser”))

Results were limited to materials held at 50 or more libraries. Materials were also limited to

books and serial publications. This search returned 1,354 records.

The collections of five libraries were analyzed with respect to their materials on nursing

education and research. The libraries are all affiliated with universities with nursing schools in

Philadelphia and Baltimore. Three of these schools (University of Pennsylvania, Johns Hopkins,

and the University of Maryland, Baltimore) have nationally ranked nursing research programs,

while the remaining two (Drexel University and Jefferson University) are less well-known. The

OCLC symbols for these schools are: University of Pennsylvania (PAU), Johns Hopkins (JHW),

University of Maryland, Baltimore (MDU), Drexel University (HHN), and Jefferson University

(TVJ). Some of these symbols are different than those for the main libraries (notably Johns

Hopkins and Drexel), as the medical collections are considered separate from the rest of the

schools’ holdings.

Brief Test Summary

Raw Scores for Brief Test

Percent Covered

Level # Titles PAU JHW MDU HHN TVJ

1 10 100 80 100 80 80

2 10 90 90 90 60 80

3 10 80 50 70 40 40

4 10 40 60 40 10 40

Brief Test Results

School RLG Scale WLN Scale

Penn 3 – Instructional 3c – Advanced Instructional Support

Johns Hopkins 4 – Research 4 – Research

UMB 3 – Instructional 3c – Advanced Instructional Support

Drexel 2 – Basic 3a – Basic Instructional Support

Jefferson 2 – Basic 3a – Basic Instructional Support

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Brief Test Detailed Results

In each of the following tables, an “x” indicates the library holds the item listed, while “no”

indicates the library does not own the title.

Note: Because only 6 items in WorldCat were held at 750 or more libraries (necessary for level

1), the first 10 items in the search were used for level 1, despite having lower counts.

Level 1 – Minimal

Penn

Johns

Hopkins

University of

Maryland -

Baltimore Drexel Jefferson

Nurse educator. [Journal] x x x x x

Research in nursing & health. [Journal] x x x x x

Western journal of nursing research.

[Journal] x x x x x

Annual review of nursing research.

[Journal] x x x x x

Just a nurse : from clinic to hospital ward,

battleground to cancer unit: the hearts and

minds of nurses today/ Kraegel &

Kachoyeanos (1989) x x x no no

Expertise in nursing practice : caring,

clinical judgment, and ethics/ Benner;

Tanner & Chesla (1996) x x x x no

Dictionary of nursing theory and research

/ Powers (2006) x no x x x

Encyclopedia of nursing research /

Fitzpatrick & Kazer (2006) x no x x x

Hospitals, paternalism, and the role of the

nurse / Ashley (1976) x x x no x

Essentials of nursing research : methods,

appraisal, and utilization; Polit & Beck

(2006) x x x x x

Percent held 100% 80% 100% 80% 80%

~ 4 ~

Level 2 - Basic

Penn

Johns

Hopkins

University of

Maryland -

Baltimore Drexel Jefferson

Evidence-based teaching : current

research in nursing education / Stevens &

Cassidy (1999) x x x x x

Nursing research : generating and

assessing evidence for nursing practice /

Polit & Beck (2008) x x x x x

Toward a caring curriculum : a new

pedagogy for nursing / Bevis & Warson

(1989) x x x no x

Basic steps in planning nursing research :

from question to proposal / Wood, Kerr,

& Brink (2006) x x x x no

Notter's essentials of nursing research /

Hott, Budin, & Notter (1999) x x x x x

Handbook of clinical nursing research /

Hinshaw & Feetham (1999) x x x no x

Basic steps in planning nursing research :

from question to proposal/ Brink & Wood

(1994) x x x x x

Nursing research : a qualitative

perspective / Munhall & Boyd (1993) x x x x x

Completing a qualitative project : details

and dialogue / Morse (1997) no no no no x

Ethnography in nursing research / Roper

& Shapira (2000) x x x no no

Percent held 90% 90% 90% 60% 80%

~ 5 ~

Level 3 – Instructional

Penn

Johns

Hopkins

University of

Maryland -

Baltimore Drexel Jefferson

From student to nurse : a longitudinal

study of socialization / Simpson & Back

(1979) x x no no no

Speaking of nursing-- : narratives of

practice, research, policy, and the

profession / Diers (2004) x no no no no

On doctoral education in nursing : the

voice of the student / Carpenter &

Hudacek (1996) x x x x x

Collaboration for articulation : RN to

BSN / Rapson (1987) x x x no no

Research methods for undergraduate

students in nursing / Seaman & Verhonick

(1982) x x x no x

Educational competencies for graduates of

associate degree nursing programs /

Coxwell & Gillerman (2000) x x x no x

Narrative research in nursing / Holloway

& Freshwater (2007) no no no no no

Design and analysis of clinical nursing

research studies / Martin & Thompson

(2000) x no x x no

The doctor of nursing practice and clinical

nurse leader : essentials of program

development and implementation for

clinical practice / Fitzpatrick & Kazer

(2009) no no x x no

Managed care curriculum for

baccalaureate nursing programs / Hart

(1995) x no x x x

Percent held 80% 50% 70% 40% 40%

~ 6 ~

Level 4 – Research

Penn

Johns

Hopkins

University of

Maryland -

Baltimore Drexel Jefferson

A Guide for teachers of nurses / Raybould

(1975) no x no no x

Analyzing the cost of baccalaureate

nursing education / Brown & Lyons

(1982) x x x no x

Reading research : a user-friendly guide

for nurses and other health professionals /

Davies & Logan (2003) no x no no no

Foundation studies for nursing using

enquiry-based learning / Grandis (2003) no no no no no

Mosby's family practice sourcebook :

evidence-based emphasis / Marshall

(2001) no no x x x

Ogier's reading research : how to make

research more approachable. / Lanoe &

Ogier (2002) x x no no no

Challenges and new directions in nursing

education / Oermann & Heinrich (2007) no x no no no

Curriculum planning in nursing education

: practical applications / Pendleton &

Myles (1991) no no no no no

Statement on graduate education in

nursing (1978) x no x no x

Nursing education facilities :

programming considerations and

architectural guide (1964) x x x no no

Percent held 40% 60% 40% 10% 40%

~ 7 ~

Brief Test Titles and OCLC Counts

Minimal Level 1

#

Count Title

1

1363

Nurse educator. Publication: [Philadelphia, Pa., etc.,

Lippincott, etc.] 1976 -

2

980

Research in nursing & health. Publication: Hoboken, N.J.,

Wiley Subscription Services. 1978-

3

912

Western journal of nursing research. Publication:

[Newbury Park, CA, etc.] Sage Publications. 1979-

4

910

Annual review of nursing research. Publication: New York

: Springer Pub. Co., 1983-

5

878

Just a nurse : from clinic to hospital ward, battleground to

cancer unit : the hearts and minds of nurses today / Author:

Kraegel, Janet M.; Kachoyeanos, Mary.Publication:

New York : Dutton, 1989

6

758

Expertise in nursing practice : caring, clinical judgment,

and ethics/ Author: Benner, Patricia E.; Tanner, Christine

A.,; Chesla, Catherine A.Publication: New York, NY :

Springer Pub. Co., 1996

7

749

Dictionary of nursing theory and research / Author:

Powers, Bethel Ann, 1943-; Knapp, Thomas R.,

Publication: New York, NY : Springer Pub. Co., 2006

8

742

Encyclopedia of nursing research / Author: Fitzpatrick,

Joyce J.,; Kazer, Meredith Wallace, Publication: New York

: Springer Pub., 2006

9

703

Hospitals, paternalism, and the role of the nurse / Author:

Ashley, Jo Ann, 1939-Publication: New York : Teachers

College Press, 1976

10

703

Essentials of nursing research : methods, appraisal, and

utilization / Author: Polit, Denise F.; Beck, Cheryl Tatano.

Publication: Philadelphia : Lippincott Williams & Wilkins,

2006

Basic Level 2

11

640

Evidence-based teaching : current research in nursing

education / Author: Stevens, Kathleen R.; Cassidy,

Virginia R.Publication: Sudbury, Mass. : Jones and

Bartlett, 1999

~ 8 ~

12

623

Nursing research : generating and assessing evidence for

nursing practice / Author: Polit, Denise F.; Beck, Cheryl

Tatano. Publication: Philadelphia : Wolters Kluwer

Health/lippincott Williams & Wilkins, 2008

13

607

Toward a caring curriculum : a new pedagogy for nursing /

Author: Bevis, Em Olivia.; Watson, Jean,Publication: New

York, N.Y. : National League for Nursing, 1989

14

570

Basic steps in planning nursing research : from question to

proposal / Author: Wood, Marilynn J.; Kerr, Janet C.,;

Brink, Pamela J.Publication: Sudbury, Mass. : Jones and

Bartlett Publishers, 2006

15

538

Notter's essentials of nursing research / Author: Hott,

Jacqueline Rose.; Budin, Wendy C.; Notter, Lucille

E.Publication: New York, N.Y. : Springer, 1999

16

504

Handbook of clinical nursing research / Author: Hinshaw,

Ada Sue.; Feetham, Suzanne. Publication: Thousand Oaks,

Calif. : Sage Publications, 1999

17

475

Basic steps in planning nursing research : from question to

proposal / Author: Brink, Pamela J.; Wood, Marilynn

J.Publication: Boston : Jones and Bartlett Publishers, 1994

18

451

Nursing research : a qualitative perspective / Author:

Munhall, Patricia L.; Boyd, Carolyn Oiler.Publication:

New York : National League for Nursing Press, 1993

19

436

Completing a qualitative project : details and dialogue /

Author: Morse, Janice M. Publication: Thousand Oaks,

Calif. : Sage Publications, 1997

20

408

Ethnography in nursing research / Author: Roper, Janice

M.; Shapira, Jill. Publication: Thousand Oaks, Calif. : Sage

Publications, 2000

Instructional Level 3

21

379

From student to nurse : a longitudinal study of socialization

/ Author: Simpson, Ida Harper.; Back, Kurt W.

Publication: Cambridge [Eng.] ; New York : Cambridge

University Press, 1979

22

354

Speaking of nursing-- : narratives of practice, research,

policy, and the profession/ Author: Diers, Donna.

Publication: Sudbury, Mass. : Jones and Bartlett

Publishers, 2004

~ 9 ~

23

336

On doctoral education in nursing : the voice of the student /

Author: Carpenter, Dona Rinaldi. ; Hudacek, Sharon.

Publication: New York : NLN Press, 1996

24

302

Collaboration for articulation : RN to BSN / Author:

Rapson, Mary Fry. Publication: New York : National

League for Nursing, 1987

25

282

Research methods for undergraduate students in nursing /

Author: Seaman, Catherine H. C.; Verhonick, Phyllis J.

Publication: New York : Appleton-Century-Crofts, 1982

26

264

Educational competencies for graduates of associate degree

nursing programs / Author: Coxwell, G.; Gillerman, H.

Corp Author: National League for Nursing., Council of

Associate Degree Nursing., Competencies Task Force.

Publication: Sudbury, Mass. : Jones and Bartlett, 2000

27

237

Narrative research in nursing / Author: Holloway, Immy.;

Freshwater, Dawn. Publication: Oxford, UK ; Malden, MA

: Blackwell Pub., 2007

28

206

Design and analysis of clinical nursing research studies /

Author: Martin, Colin R., 1964-; Thompson, David R.,

Publication: London ; New York : Routledge, 2000

29

185

The doctor of nursing practice and clinical nurse leader :

essentials of program development and implementation for

clinical practice / Author: Fitzpatrick, Joyce J.; Kazer,

Meredith Wallace, Publication: New York : Springer, 2009

30

152

Managed care curriculum for baccalaureate nursing

programs / Author: Hart, Sylvia. Publication: Washington,

DC : American Nurses Foundation, 1995

Research Level 4

31

140

A Guide for teachers of nurses / Author: Raybould,

Elizabeth. Publication: Oxford : Blackwell Scientific, 1975

32

133

Analyzing the cost of baccalaureate nursing education /

Author: Brown, Elsa L.; Lyons, John M. Publication: New

York, N.Y. : National League for Nursing, 1982

33

123

Reading research : a user-friendly guide for nurses and

other health professionals / Author: Davies, Barbara;

Logan, Jo. Publication: Toronto : Mosby, 2003

34

110

Foundation studies for nursing using enquiry-based

learning / Author: Grandis, Sue. Publication: Houndmills,

Basingstroke, Hampshire; New York, N.Y. : Palgrave

Macmillan, 2003

~ 10 ~

35

100

Mosby's family practice sourcebook : evidence-based

emphasis / Author: Marshall, Kenneth G. Publication: St.

Louis, MO : Mosby, Inc., 2001

36

92

Ogier's reading research : how to make research more

approachable. Author: Lanoë, Nicky.; Ogier, Margaret E.

Publication: London : Baillière Tindall, 2002

37

81

Challenges and new directions in nursing education /

Author: Oermann, Marilyn H.; Heinrich, Kathleen T.

Publication: New York : Springer, 2007

38

72

Curriculum planning in nursing education : practical

applications / Author: Pendleton, Stella; Myles, Alan.

Publication: London ; New York : E. Arnold, 1991

39

62

Statement on graduate education in nursing / Publication:

Kansas City, Mo. : The Association, 1978

40

51

Nursing education facilities : programming considerations

and architectural guide / Corp Author: Joint Committee on

Educational Facilities for Nursing of the National League

for Nursing and the Public Health Service.Publication:

Washington, D.C. : U.S. Dept. of Health, Education, and

Welfare, Public Health Service : For sale by the Supt. of

Docs., U.S. G.P.O., 1964

Coverage Power Test Summary

School RLG level WLN level

Penn 4 – Research 4 – Research

Johns Hopkins 3 – Instructional 3a – Basic Instructional Support

University of Maryland – Baltimore 4 – Research 4 – Research

Drexel 2 – Basic 2a – Introductory

Jefferson 3 – Instructional 3b – Intermediate Instructional Support

~ 11 ~

Coverage Power Test Details

cg Ranges WLN RLG Lit PAU

PAU

% JHW

JHW

% MDU

MDU

% HHN

HHN

% TVJ

TVJ

%

31

2500

or

more 1a Min. 0 0 0% 0 0% 0 0% 0 0% 0 0%

30

2000

to

2499 1a 1 0 0 0% 0 0% 0 0% 0 0% 0 0%

29

1500-

1999 1a 1 0 0 0% 0 0% 0 0% 0 0% 0 0%

28

1000-

1499 1a 1 1 1 100% 1 100% 1 100% 1 100% 1 100%

27

900-

999 1b 1 3 3 100% 3 100% 3 100% 3 100% 3 100%

26

800-

899 1b 1 1 1 100% 1 100% 1 100% 0 0% 0 0%

25

700-

799 2a Bas. 5 5 100% 3 60% 5 100% 3 60% 1 20%

24

600-

699 2a 2 10 10 100% 8 80% 8 80% 5 50% 9 90%

23

500-

599 2b 2 30 25 83% 21 70% 27 90% 12 40% 21 70%

22

400-

499 2b 2 70 60 86% 48 69% 61 87% 29 41% 42 60%

21

300-

399 3a Instr. 161 115 71% 88 55% 134 83% 31 19% 94 58%

20

200-

299 3b 3 208 137 66% 85 41% 141 68% 26 13% 105 50%

19

150-

199 3c 3 156 93 60% 50 32% 90 58% 18 12% 55 35%

18

100-

149 4 Res. 261 133 51% 64 25% 144 55% 14 5% 98 38%

17 75-99 4 4 193 84 44% 36 19% 70 36% 12 6% 53 27%

16 50-74 4 4 252 76 30% 46 18% 82 33% 9 4% 28 11%

15 25-49 4 4 505 95 19% 49 10% 79 16% 22 4% 27 5%

~ 12 ~

Comparison of Brief Test and Coverage Power Test

Brief Test Coverage Power Test

School RLG Level WLN Level RLG Level WLN Level

Penn 3 3c 4 4

Johns Hopkins 4 4 3 3a

UMB 3 3c 4 4

Drexel 2 3a 2 2a

Jefferson 2 3a 3 3b

Interestingly, the levels attained by each library changed depending on whether a brief test or a

coverage power test was being administered. The University of Pennsylvania, the University of

Maryland, Baltimore, and Jefferson University all scored higher on the coverage power test.

Johns Hopkins, however, went from a research level collection to an instructional collection.

Drexel University’s collection remained more or less the same regardless of the test used.

Because the coverage power test looks at the library’s entire collection instead of only 40 items,

it is likely that the levels for the coverage power test are a more accurate measure of each

library’s collection than is the brief test.

WorldCat Collection Analysis

Top LC Subject Headings for RT71-81.5

Nursing 100%

Soins infirmiers 94%

Nursing research 42%

Education, Nursing 28%

Verpleegkunde 22%

Onderzoek 16%

Evidence-based medicine 14%

Krankenplege 10%

Onderzoeksmethoden 10%

Nurses 10%

Research design 8%

Nursing schools 8%

Education, Nursing, Continuing 8%

Wetenschappelijke technieken 8%

Staff development 8%

Soins medicaux 6%

Evidence-based nursing 6%

Infirmieres 6%

Medecine factuelle 6%

Engermagem (metodos de pesquisa) 6%

~ 13 ~

Top Authors for RT71-81.5

Polit, Denise F. 14%

Beck, Cheryl Tatano 10%

Fitzpatrick, Joyce J., 1944- 6%

Hungler, Bernadette P. 6%

Wood, Marilynn J. 4%

Brink, Pamela J. 4%

Grove, Susan K. 4%

Watson, Jean, 1940- 4%

Waltz, Carolyn Feher 4%

National Nursing Staff Development Organization

(U.S.) 4%

Burns, Nancy, Ph.D. 4%

Benner, Patricia E. 4%

Haase, Patricia T. 4%

Oermann, Marilyn H. 4%

Tanner, Christine A., 1947- 2%

Kachoyeanos, Mary 2%

Midwest Nursing Research Society 2%

Kraegel, Janet M. 2%

National League for Nursing 2%

American Association of Colleges of Nursing 2%

Languages of RT71-81.5 Titles

English 6838

French 178

Spanish 61

Chinese 12

Swedish 11

German 7

Dutch 4

Norwegian 2

Portuguese 2

Japanese 1

Russian 1

Hebrew 1

Danish 1

Thai 1

Ukrainian 1

Korean 1

Other 11

~ 14 ~

Publish or Perish Journal Impact Analysis

The most widely owned publication in the field is Nurse Educator. According to Publish or

Perish, the three most highly cited works in this journal are:

Benner, P., & Wrubel, J. (1982). Skilled clinical knowledge: The value of perceptual awareness.

Nurse Educator, 7(3), 11-17. (Cited 124 times)

Darling, L.A.W. (1985). What do nurses want in a mentor? Nurse Educator, 10(1), 18-20.

(Cited 98 times)

Piles, Carole L. (1990). Providing spiritual care. Nurse Educator, 15(1), 36-41. (Cited 86

times)

Audience Level Analysis

Two titles from each of the four brief test levels were selected and analyzed using OCLC’s

Audience Level Module. Interestingly, almost all titles selected were identified to be in the

range for the Instructional level (0.51-0.75). This included Basic titles that have a higher

audience level than expected as well as Research titles that have a lower audience level than

expected. While most items were in the Instructional range, the audience levels did increase as

holding counts decreased, as would be expected.

Minimal

Just a nurse : from clinic to hospital ward, battleground to cancer unit : the hearts and minds of

nurses today by Kraegel, Janet M.; Kachoyeanos, Mary.

Audience Level: 0.24 (Minimal – within 0-0.25 range)

Hospitals, paternalism, and the role of the nurse by Ashley, Jo Ann

Audience Level: 0.48 (Basic – not within 0-0.25 range)

Basic

Toward a caring curriculum : a new pedagogy for nursing by Bevis, Em Olivia.; Watson, Jean

Audience Level: 0.57 (Instructional – not within 0.26-0.50 range)

Basic steps in planning nursing research : from question to proposal by Brink, Pamela J.; Wood,

Marilynn J.

Audience Level: 0.63 (Instructional – not within 0.26-0.50 range)

Instructional

Speaking of nursing-- : narratives of practice, research, policy, and the profession by Diers,

Donna

Audience Level: 0.6 (Instructional – within 0.51-0.75 range)

~ 15 ~

Educational competencies for graduates of associate degree nursing programs / by Coxwell, G.;

Gillerman, H.

Audience Level: 0.63 (Instructional – within 0.51-0.75 range)

Research

Analyzing the cost of baccalaureate nursing education by Brown, Elsa L.; Brown, Elsa L.;

Lyons, John M.

Audience Level: 0.72 (Instructional – not within 0.76-1 range)

Statement on graduate education in nursing / by [not given]

Audience Level: 0.74 (Instructional – not within 0.76-1 range)

Web of Science Journal Analysis

In order to search for the literature in the RT71-81.5 range in Web of Science, I performed a

search using the Science Citation Index Expanded and the Social Sciences Citation Index for

<Topic=("nurs* education") OR Topic=("nurs* research")>. The results of this search were

analyzed in four ways:

Top 10 Authors:

Authors Record Count % of 5834

[ANON] 63 1.08%

WATSON, R 33 0.57%

JOHNSON, M 20 0.34%

HAPPELL, B 18 0.31%

LEINO-KILPI, H 17 0.29%

JACKSON, D 16 0.27%

VIRANI, R 16 0.27%

WEBB, C 16 0.27%

IRONSIDE, PM 15 0.26%

ESTABROOKS, CA 14 0.24%

Top 10 Institutions

Institution Name Record Count % of 5834

UNIV WISCONSIN 102 1.75%

UNIV PENN 84 1.44%

UNIV ALBERTA 80 1.37%

UNIV N CAROLINA 78 1.34%

UNIV TEXAS 70 1.20%

UNIV CALIF SAN FRANCISCO 66 1.13%

UNIV WASHINGTON 63 1.08%

UNIV MICHIGAN 59 1.01%

UNIV NOTTINGHAM 55 0.94%

INDIANA UNIV 52 0.89%

~ 16 ~

Top 10 Source Titles

Source Title

Record

Count % of 5834

JOURNAL OF ADVANCED NURSING 929 15.92%

NURSE EDUCATION TODAY 703 12.05%

JOURNAL OF NURSING EDUCATION 466 7.99%

JOURNAL OF PROFESSIONAL NURSING 278 4.77%

INTERNATIONAL JOURNAL OF NURSING STUDIES 208 3.57%

JOURNAL OF CLINICAL NURSING 188 3.22%

NURSING OUTLOOK 165 2.83%

NURSING RESEARCH 165 2.83%

NURSING SCIENCE QUARTERLY 119 2.04%

ADVANCES IN NURSING SCIENCE 90 1.54%

Literature by Publication Year (1980-2010)

Publication Year Record Count % of 5834

1980 39 0.67%

1981 25 0.43%

1982 30 0.51%

1983 30 0.51%

1984 53 0.91%

1985 49 0.84%

1986 42 0.72%

1987 46 0.79%

1988 40 0.69%

1989 29 0.50%

1990 57 0.98%

1991 42 0.72%

1992 87 1.49%

1993 76 1.30%

1994 150 2.57%

1995 219 3.75%

1996 196 3.36%

1997 215 3.69%

1998 208 3.57%

1999 238 4.08%

2000 268 4.59%

2001 238 4.08%

2002 255 4.37%

2003 261 4.47%

2004 285 4.89%

2005 287 4.92%

2006 360 6.17%

2007 438 7.51%

2008 507 8.69%

2009 524 8.98%

2010 531 9.10%

~ 17 ~