Year	Cases per 100,000
1990	12.1
1991	15.3
1992	19.4
1993	24.6
1994	30.8
1995	35.2
1996	44.4
1997	52.1
1998	65.4
1999	73.4
2000	93.5
2001	103.7
2002	112.4
2003	113.9
2004	120.7
2005	133.8
2006	151.8
2007	169.6