Year	Cases per 100,000
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0.1
1996	0.5
1997	1.4
1998	2.3
1999	3
2000	3.8
2001	4.7
2002	5.8
2003	6.8
2004	7.8
2005	9.3
2006	9.8
2007	10.3