Year	Cases per 100,000
1990	1679
1991	2310
1992	2278
1993	1845
1994	1527
1995	787
1996	1011
1997	1189
1998	1144
2000	1122
2001	353.7
2002	219.3
2003	55.42
2004	19.54
2005	8.577
2006	3.077