Year	Cases per 100,000
1990	136.7
1991	166.1
1992	130
1993	107.2
1994	83.39
1995	108.6
1996	89.35
1997	60.52
1998	50.93
1999	35.32
2000	29.82
2001	28.91
2002	23.09
2003	34.65
2004	20.13
2005	27.32
2006	22.64