Year	Cases per 100,000
1980	14
1981	15
1982	15
1983	14
1984	15
1985	19
1986	17
1987	24
1988	30
1989	15
1990	21
1991	20
1992	15
1993	11
1994	8
1995	12
1996	13
1997	14
1998	17
1999	20
2000	21
2001	36
2002	29
2003	33
2004	41
2005	44
2006	49
2007	56