8
Table 1 
Service Trends in ARL Libraries, 1991‐2005 
Median Values for Time‐Series Trends12 
 
Year  ILL: 
Borrowed 
Group 
Pres. 
Participants 
In Group
Pres.
Reference
Trans.
Initial
Circ.
Total
Circ.
Ratio of 
Initial to 
Total Circ. 
Total 
Staff 
Total
Students
(Libraries)  (103)  (84)  (82) (80) (36) (80) (34)  (105)  (103)
1991 
10,397 508 7,137 128,272
296,964
509,673 1.26 271 18,290
1992  11,362
526 7,154 132,562
342,989 554,579
1.27 265 18,273
1993  12,489 616 7,688 137,580 343,293 568,628 1.32 262 18,450
1994  14,007 568 7,831 150,144 369,996 572,749 1.31 264 18,305
1995 
14,472 687 8,461 148,175
347,144
578,989 1.32 267 18,209
1996 
15,278 719 8,410 156,306
336,481
560,244 1.39 264 18,320
1997 
16,264 687 9,218 152,164
348,157
542,438 1.37 273 18,166
1998 
17,656 698 9,462 134,944
354,924
514,574 1.37 273 18,335
1999 
18,942 711 9,406 129,089
300,923
514,087 1.38 277 18,609
2000 
20,475 722 9,596 117,027
273,231
482,542 1.42 267 18,908
2001 
21,902 669 10,121 104,744
265,195
467,277 1.48 269 19,102
2002 
21,339 776 11,350 96,829
251,146
462,223 1.51 279 19,925
2003  22,146 806 12,516 91,093 248,689 479,733 1.57 277 21,132
2004  25,737 757 12,864 85,478 261,526 496,369 1.60 273 21,562
2005 
25,729 803 13,782 66,300 250,971 473,216 1.58 267 22,047
Avg annual 
% change 
6.7% 3.3% 4.8% -4.6% -1.2% -0.5% 1.6% -0.1% 1.3%
12 Series for Interlibrary Borrowing, Group Presentations, Participants in Group Presentations, Reference Transactions, Total 
Circulation, and Total Students revised due to unavailable data. 
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