Year	Cases per 100,000
1990	44
1991	52.6
1992	69.7
1993	89.5
1994	112.7
1995	135.4
1996	158.7
1997	186.4
1998	211
1999	230.8
2000	239.8
2001	235.4
2002	234.5
2003	235.9
2004	230.1
2005	204.7
2006	181.5
2007	168.7