Year	Cases per 100,000
1990	697.7
1991	565.4
1992	382.7
1993	427.3
1994	268.3
1995	159.1
1996	102.5
1997	138.9
1998	365.2
1999	721.8
2000	801.2
2001	873.6
2002	687.4
2003	407.7
2004	222.4
2005	130.5
2006	74.71