Year	Cases per 100,000
1990	12.2
1991	18.6
1992	27.4
1993	38.9
1994	52.7
1995	68
1996	84.5
1997	103.3
1998	126.8
1999	157.8
2000	196.8
2001	239.3
2002	277.6
2003	306.3
2004	325.1
2005	336.3
2006	342.3
2007	345.4