Year	Cases per 100,000
1990	279
1991	210.7
1992	193.1
1993	203.7
1994	293.6
1995	287.5
1996	245.8
1997	123
1998	60.73
1999	48.81
2000	54.59
2001	53.75
2002	45.42
2003	25.63
2004	24.43
2005	21.71
2006	20.27