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
2000	0
2001	0.1
2002	0.3
2003	0.7
2004	1.4
2005	2.6
2006	3.6
2007	4.2