Year	Cases per 100,000
1990	4.5
1991	8.4
1992	14.1
1993	20.8
1994	27.2
1995	32.6
1996	37
1997	41
1998	45.3
1999	50.3
2000	56.5
2001	63.9
2002	72.2
2003	80.8
2004	89.5
2005	98
2006	106.2
2007	114.2