Year	Cases per 100,000
1990	22
1991	26.3
1992	34.8
1993	44.7
1994	56.4
1995	67.7
1996	79.4
1997	93.2
1998	105.5
1999	115.4
2000	119.9
2001	117.7
2002	117.3
2003	118
2004	115.1
2005	102.3
2006	90.8
2007	84.4