Year	Cases per 100,000
1990	9.8
1991	13.4
1992	17.4
1993	22
1994	27.2
1995	32.8
1996	38.2
1997	44.4
1998	50.9
1999	57.6
2000	64.7
2001	71.2
2002	76.8
2003	80.2
2004	80.8
2005	79.2
2006	76.5
2007	73.6