Year	Cases per 100,000
1990	23.2
1991	38.6
1992	60.2
1993	92
1994	136.7
1995	194
1996	262.1
1997	337.7
1998	416.1
1999	529.5
2000	624.8
2001	722.3
2002	788.7
2003	857.4
2004	900.8
2005	914.3
2006	938.1
2007	962