Year	Cases per 100,000
1990	15.8
1991	45.31
1992	28.95
1993	18.76
1994	26.14
1995	27.34
1996	17.47
1997	18.16
1998	36.62
1999	32.35
2000	35.12
2001	30.87
2002	71.93
2003	143.6
2004	160.5
2005	113.5
2006	50.58