Research Library Trends Tables and Graphs · 9
Graph 1
Service Trends
in
ARL Libraries, 1991–2009
-70%
-50%
-30%
-10%
10%
30%
50%
70%
90%
110%
130%
150%
170%
190%
Interlibrary
Borrowing
(+171%)
Reference
Transactions
(-56%)
Initial
Circulation**
(-27%)
Total
Circulation**
(-19%)
Total
Staff
(-8%)
Total
Students
(+27%)
Circulation
Ratio:
Initial to
Total
(+30%)
Group
Presentations
(+73%)
Participants
in Group
Presentations
(+110%)
%
C
h
a
n
g
e
S
i
n
c
e
1
9
9
1
**Total
Circulation includes Initial and Renewal but excludes Reserve Circulation.
Source: ARL Statistics 2008–2009, Association of Research Libraries, Washington, DC
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