Figure 3 : NIS Hospital Sampling Frame, by Year
Year
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
Number of Hospitals
1,247
1,658
1,620
1,604
1,591
2,168
2,135
2,284
2,268
2,452
2,438
2,520
3,034
3,377
3,570
3,763
3,705
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