Year	Cases per 100,000
1990	7.1
1991	10
1992	13.6
1993	18.1
1994	23.4
1995	29.8
1996	36.7
1997	44.8
1998	53.8
1999	63.7
2000	74.3
2001	84.8
2002	94.4
2003	101.6
2004	104.9
2005	105.4
2006	103.9
2007	102.1