Year	Cases per 100,000
1983	33.81
1984	35.16
1985	35.87
1986	37.5
1987	35.27
1988	34.47
1989	34.74
1990	35.45
1991	35.31
1992	36.45
1993	35.82
1994	38.32
1995	39.21
1996	40.93
1997	38.86