Year Per 100,000 People 1981 6.2266 1982 6.2739 1985 4.8867 1986 7.47 1987 7.6092 1988 6.0294 1989 5.7573 1990 5.8224 1991 5.6069 1992 5.2432 1993 4.0956 1994 4.8617 1995 2.617 1996 3.0767 1997 3.4468 1998 4.0441