Year	Cases per 100,000
1990	3.5
1991	4.1
1992	4.7
1993	5.3
1994	5.9
1995	6.5
1996	7.1
1997	7.6
1998	8.1
1999	8.5
2000	8.8
2001	9
2002	9.2
2003	9.3
2004	9.3
2005	9.3
2006	9.2
2007	9.2