Year	Cases per 100,000
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0.1
1996	0.2
1997	0.2
1998	0.4
1999	0.6
2000	0.9
2001	1.4
2002	2.2
2003	3
2004	4.2
2005	5.6
2006	7.3
2007	9.1