Year	Cases per 100,000
1990	96.37
1991	59.52
1992	114.5
1993	105.1
1994	56.19
1995	102.7
1996	112.3
1997	107.5
1998	206.9
1999	64.99
2000	31.76
2001	14.39
2002	11.92
2003	7.669
2004	5.346
2005	4.485
2006	5.286