Year	Cases per 100,000
1990	17.3
1991	27.3
1992	40.2
1993	56.9
1994	76.2
1995	97.5
1996	118.2
1997	140.3
1998	162.3
1999	184.8
2000	208.3
2001	230.7
2002	250.5
2003	264.2
2004	269.1
2005	267.6
2006	262.2
2007	257.8