Figure 3 : NIS Hospital Sampling Frame, by Year
Year
1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002
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

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