Year	Cases per 100,000
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0.1
2000	0.1
2001	0.1
2002	0.2
2003	0.3
2004	0.4
2005	0.5
2006	0.7
2007	0.7