Year	Cases per 100,000
1990	66.9
1991	81.5
1992	95
1993	107.8
1994	121.1
1995	135
1996	146.3
1997	156.1
1998	161.2
1999	165.3
2000	170.7
2001	172.7
2002	173.4
2003	167.8
2004	162.3
2005	154.6
2006	146.6
2007	139