Year	Cases per 100,000
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0.1
1999	0.1
2000	0.2
2001	0.2
2002	0.4
2003	0.5
2004	0.8
2005	1.1
2006	1.5
2007	1.5