Year	Cases per 100,000
1990	18.65
1991	12.52
1992	7.462
1993	33.62
1994	25.38
1995	21.08
1996	63.76
1997	53.48
1998	60.09
1999	115
2000	142.3
2001	57.6
2002	33.6
2003	28.58
2004	28.18
2005	16.18
2006	25.06