Year	Cases per 100,000
1990	6.7
1991	10.4
1992	16
1993	23.5
1994	33
1995	43.9
1996	55.3
1997	66.1
1998	75.6
1999	83.4
2000	89.7
2001	94.8
2002	99
2003	102.5
2004	105.5
2005	108.3
2006	111
2007	113.7