Year	Cases per 100,000
1980	51
1981	58
1982	51
1983	40
1984	40
1985	40
1986	31
1987	52
1988	20
1989	17
1990	15
1991	12
1992	11
1994	19
1996	20
1998	27
1999	2
2000	4
2001	2
2002	2
2003	3
2004	2
2005	3
2006	2
2007	2