Year	Cases per 100,000
1990	197.6
1991	238.4
1992	271.3
1993	304.4
1994	335.3
1995	366.4
1996	392.5
1997	425.1
1998	460.2
1999	498.4
2000	540.6
2001	579.7
2002	612.1
2003	628.5
2004	623
2005	601.5
2006	570.6
2007	539.1