Year	Cases per 100,000
1990	8.8
1991	10.6
1992	12.4
1993	13.8
1994	15
1995	15.7
1996	16.1
1997	16.1
1998	15.9
1999	15.5
2000	14.9
2001	14.3
2002	13.6
2003	12.9
2004	12.2
2005	11.6
2006	11
2007	10.5