Year	Cases per 100,000
1990	4.7
1991	6.6
1992	7.7
1993	8.2
1994	8.6
1995	8.8
1996	9.1
1997	9.4
1998	9.7
1999	10.1
2000	10.5
2001	10.9
2002	11.3
2003	11.7
2004	12
2005	12.3
2006	12.6
2007	12.9