Year	Cases per 100,000
1990	37150
1991	43820
1992	46190
1993	36910
1994	37450
1995	32760
1996	22780
1997	17800
1998	18500
1999	15620
2000	16340
2001	17910
2002	17090
2003	20160
2004	19590
2005	16170
2006	15560