Year	Cases per 100,000
1990	0.3328
1991	1.541
1992	0.3623
1993	0.3037
1994	8.675
1995	36.45
1996	166.7
1997	124.5
1998	64.45
1999	28.62
2000	18.74
2001	12.92
2002	6.149
2003	5.831
2004	4.647
2005	2.898
2006	1.701