Year	Cases per 100,000
1990	157.4
1991	210.4
1992	266.5
1993	310.3
1994	344.1
1995	371.3
1996	385.1
1997	400.3
1998	405.6
1999	419.3
2000	417.9
2001	434.9
2002	437.9
2003	451.8
2004	431
2005	406.7
2006	378.6
2007	351.9