Year	Cases per 100,000
1990	92.45
1991	98.55
1992	216.3
1993	219.7
1994	249.7
1995	3221
1996	2585
1997	8383
1999	15760
2000	7670
2001	575.3
2002	970
2003	878
2004	774.3
2005	950.7
2006	931.2