Year	Cases per 100,000
1990	24.3
1991	27.2
1992	29
1993	30.8
1994	32.7
1995	35.3
1996	38.2
1997	42.7
1998	47.8
1999	53.1
2000	58.3
2001	62.5
2002	65.5
2003	66.4
2004	64.9
2005	62
2006	58.4
2007	55.4