Year	Cases per 100,000
1990	33.5
1991	40.7
1992	47.5
1993	53.9
1994	60.6
1995	67.5
1996	73.2
1997	78.1
1998	80.6
1999	82.7
2000	85.3
2001	86.3
2002	86.7
2003	83.9
2004	81.1
2005	77.3
2006	73.3
2007	69.5