Year	Cases per 100,000
1983	32.45
1984	31.03
1985	33.12
1986	34.17
1987	30.86
1988	33.59
1989	33.98
1990	34.58
1991	34.49
1992	33.52
1993	33.22
1994	34.99
1995	36.14
1996	38.32
1997	38.82