Year	Cases per 100,000
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0.1
1996	0.1
1997	0.2
1998	0.4
1999	0.6
2000	0.8
2001	1
2002	1.2
2003	1.3
2004	1.3
2005	1.4
2006	1.5
2007	1.6