Year	Cases per 100,000
1980	39
1981	36
1982	33
1983	44
1984	12
1985	62
1986	13
1987	18
1988	12
1989	20
1990	17
1991	16
1993	15
1994	9
1995	25
1996	17
1997	15
1998	19
1999	20
2000	19
2001	20
2002	19
2003	20
2004	21
2005	25
2006	27
2007	27