Year	Cases per 100,000
1980	16
1981	15
1982	18
1983	20
1984	22
1985	29
1986	25
1987	16
1988	20
1989	16
1990	23
1991	18
1992	25
1993	12
1994	36
1995	40
1996	42
1997	55
1998	43
1999	55
2000	57
2001	57
2002	80
2003	86
2004	82
2005	86
2006	96
2007	80