Year	Cases per 100,000
1990	10.22
1991	8.74
1992	6.294
1993	4.965
1994	5.166
1995	3.861
1996	2.709
1997	2.154
1998	2.157
1999	2.115
2000	1.458
2001	2.094
2002	13.29
2003	13.02
2004	11.1
2005	7.581
2006	8.751