Year	Cases per 100,000
1990	132.7
1991	151.8
1992	242.7
1993	413.1
1994	520.2
1995	807.4
1996	858.6
1997	746.5
1998	989.1
1999	657.8
2000	271.7
2001	305.7
2002	325.8
2003	298.3
2004	347.1