Year	Cases per 100,000
1990	1633
1991	1737
1992	2718
1993	4245
1994	4784
1995	4396
1996	3001
1997	1774
1998	1125
1999	775.8
2000	607.4
2001	437.3
2002	361
2004	392.3
2005	572.3
2006	294