Year	Cases per 100,000
1990	67.6
1991	351.7
1992	181.9
1993	11.31
1994	300.9
1996	236.5
1998	416.1
1999	14.19
2000	197.1
2001	112.8
2003	109.2
2004	118.1
2005	234.3
2006	346.6