Year	Cases per 100,000
1990	374.8
1991	404.2
1992	394.9
1993	297.3
1994	354.5
1995	350
1996	277.4
1997	235.9
1998	279.1
1999	355.2
2000	350.8
2001	219.8
2002	194.3
2003	224.9
2004	252.1
2005	322.8
2006	290.1