Year	Cases per 100,000
1990	5
1991	5.5
1992	5.8
1993	6.2
1994	6.5
1995	6.9
1996	7.2
1997	7.8
1998	8.4
1999	9.1
2000	9.9
2001	10.7
2002	11.5
2003	12
2004	12.2
2005	12
2006	11.8
2007	11.5