Year	Cases per 100,000
1983	8.26
1984	7.3
1985	8.17
1986	7.66
1987	6.96
1988	8.73
1989	7.59
1990	6.98
1991	7.61
1992	9.01
1993	7.71
1994	7.63
1995	8.72
1996	8.63
1997	10.46