Year	Cases per 100,000
1990	8.9
1991	12.7
1992	17.1
1993	22.3
1994	28.2
1995	34.6
1996	40.7
1997	47.5
1998	54.5
1999	61.8
2000	69.5
2001	76.8
2002	83.2
2003	87.5
2004	88.7
2005	87.8
2006	85.6
2007	83.3