Year	Cases per 100,000
1990	21.19
1991	9.251
1992	29.25
1993	245.6
1994	468.7
1995	456.3
1996	223.3
1997	60.66
1998	40.84
1999	16.99
2000	7.425
2001	4.925
2002	3.62
2003	1.29
2004	0.5645
2005	0.1679
2006	0.08419