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%
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%)
%
Change
Since
1991