Year	Cases per 100,000
1990	399.7
1991	367.8
1992	344.4
1994	1140
1995	1588
1996	3968
1997	2672
1998	2899
1999	3224
2000	3009
2001	3879
2002	2952
2003	3282
2004	1821
2005	1931
2006	797.5