Year	Cases per 100,000
1980	27
1981	35
1982	24
1983	22
1984	7
1985	11
1986	48
1987	37
1988	10
1989	18
1990	9
1991	20
1992	19
1993	10
1994	17
1995	12
1996	15
1997	9
1998	7
2002	3
2006	28
2007	4