Year	Cases per 100,000
1990	28.5
1991	37.5
1992	47.5
1993	57.6
1994	65.9
1995	71.4
1996	75.5
1997	77.4
1998	78.1
1999	77.2
2000	74.7
2001	70.9
2002	65.9
2003	59.9
2004	53.5
2005	47.5
2006	42.6
2007	38.5