Year	Cases per 100,000
1990	11
1991	17.6
1992	24.9
1993	32.7
1994	39.7
1995	46
1996	50.8
1997	55.7
1998	60.4
1999	65.2
2000	70.4
2001	75.1
2002	79.1
2003	81.2
2004	80.8
2005	78.7
2006	75.8
2007	73.5