Research Library Trends · 9
gRaph 1
seRvice TRends
in
aRL LibRaRies, 1991–2007
-60%
-40%
-20%
0%
20%
40%
60%
80%
100%
120%
140%
160%
180%
%
Change
Since
1991
Source: ARL Statistics 2006–2007, Association of Research Libraries, Washington, DC
Interlibrary
Borrowing
(+158%)
Group
Presentations
(+63%)
Reference
Transactions
(-51%)
Total
Circulation**
(-10%)
Total
Staff
(-2%)
Total
Students
(+25%)
**
Total Circulation includes Initial and Renewals but excludes Reserve Circulation
Participants in
Group
Presentations
(+102%)
Circulation Ratio:
Initial to Total
(+26%)
Initial
Circulation**
(-25%)
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