Year	Cases per 100,000
1980	2
1981	4
1982	9
1983	18
1984	5
1985	5
1986	10
1987	3
1988	2
1989	3
1990	0
1991	5
1992	7
1995	7
1996	0
1997	6
1998	0
1999	0
2000	0
2001	0
2002	0
2004	9
2006	5