Year	Cases per 100,000
1990	11
1991	15.4
1992	19.9
1993	24.9
1994	29.9
1995	35.1
1996	39.7
1997	44.9
1998	50.2
1999	55.9
2000	61.9
2001	67.8
2002	72.9
2003	76.4
2004	77.3
2005	76.5
2006	74.6
2007	72.7