Figure 3: NIS Hospital Sampling Frame, by Year
Year
Number of Hospitals
1988
1,247
1989
1,658
1990
6,620
1991
1,604
1992
1,591
1993
2,168
1994
2,135
1995
2,284
1996
2,268
1997
2,452
1998
2,438
1999
2,520
2000
3,034
2001
3,377
2002
3,570
2003
3,763
2004
3,305
2005
3,860
2006
3,958
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