Year	Cases per 100,000
1990	15.14
1991	20.92
1992	31.4
1993	77.97
1994	136.8
1995	130.9
1996	95.37
1997	54.6
1998	55.79
1999	31.23
2000	16.77
2001	15.62
2002	14.56
2003	12.96
2004	7.343
2005	2.812
2006	1.038