Year	Cases per 100,000
1980	78
1981	11
1982	14
1983	4
1984	22
1985	13
1986	9
1987	3
1988	6
1989	3
1990	2
1991	1
1992	4
1993	12
1994	0
1995	12
1996	5
1997	5
1998	7
1999	8
2000	14
2001	9
2002	9
2003	12
2004	7
2005	6
2006	11
2007	10