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Interlibrary Loans Received per 1,000 population, 1991-2002

Abstract

Interlibrary loans rose over the period. Smaller libraries started with a substantially higher number but by 2002, the second and third quartile libraries means were quite close. The percentage increases are dramatic and indicate that ILL became a major part of all library's method of supplying their libraries' users.

There is a Rank Order Table for this variable in 2002 and a summary table of the ranks by state from 1992-2002.

A line plot of the mean number of interlibrary loans received per 1,000 population at the five groups by year

Interlibrary Loans Received per 1,000 population by Group
	First Quartile	Second Quartile	Third Quartile	Fourth Quartile	95%
1990	.	.	.	.	.
1991	204.84	115.92	77.42	37.13	15.29
1992	190.12	104.68	79.92	39.69	17.36
1993	216.19	120.97	89.38	42.77	19.08
1994	196.31	112.69	88.53	45.69	20.22
1995	209.59	122.61	102.00	51.15	20.93
1996	212.41	127.85	113.39	59.38	21.60
1997	212.08	140.78	128.34	67.06	21.99
1998	208.82	149.80	138.96	73.66	26.90
1999	208.36	153.64	149.02	77.84	28.00
2000	195.95	168.54	166.23	87.49	32.71
2001	219.94	195.54	196.75	101.50	38.42
2002	246.06	230.94	229.43	121.77	44.65
# increase, 1991-2002	41.22	115.02	152.01	84.64	29.36
% increase, 1991-2002	20.1	99.2	196.3	228.0	192.0

Note: The value for the Town of Ulster Public Library, Kinston, New York (newkey = NY0259) for POPU_UND for 1992 was 8,478, 1993 was 1, and 1994 was 11,507. In this analysis, the value for 1993 was changed to 9,993, the mean of the 1992 and 1994 figures.

October 19, 2004

Analysis of 2001 data
Analyzing Trends
Trends Results
Tables
Public Libraries in the United States
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