Year	Cases per 100,000
1990	30
1991	49.1
1992	71.7
1993	94.6
1994	115
1995	128.4
1996	132.6
1997	138.9
1998	143.7
1999	146
2000	148.5
2001	144.6
2002	144.7
2003	142
2004	139.6
2005	134.2
2006	125.9
2007	117.7