Year	Cases per 100,000
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0.1
1997	0.2
1998	0.5
1999	1.1
2000	2.3
2001	4.1
2002	5.7
2003	7
2004	7.8
2005	8.3
2006	8.7
2007	9