Year	Cases per 100,000
1990	181.4
1991	114
1992	85.6
1993	71.86
1994	50.78
1995	59.7
1996	102.5
1997	46.39
1998	19.78
1999	20.2
2000	12.03
2001	5.749
2002	1.83
2003	1.295
2004	1.703
2005	0.9897
2006	0.6507