Year	Cases per 100,000
1990	504.5
1991	361
1992	302.9
1993	204.9
1994	179.5
1995	143.8
1996	150.6
1997	165.8
1998	220.4
1999	208.6
2000	134.7
2001	103.8
2002	72.24
2003	60.13
2004	42.66
2005	47.27
2006	47.75