Year	Cases per 100,000
1990	6.5
1991	13.7
1992	26.3
1993	46.3
1994	72.3
1995	99.9
1996	123.5
1997	146.9
1998	170
1999	193.8
2000	207.8
2001	217.1
2002	231.2
2003	239.7
2004	242.8
2005	241.3
2006	240.8
2007	240.4