Year	Cases per 100,000
1983	26.64
1984	25.09
1985	24.97
1986	27.46
1987	26.14
1988	27.75
1989	28.76
1990	26.65
1991	28.37
1992	29.06
1993	27.81
1994	29.77
1995	29.43
1996	27.55
1997	27.96