Year	Cases per 100,000
1990	3104
1991	5779
1992	5424
1993	4514
1994	5365
1995	8026
1997	4350
1998	5596
1999	3712
2000	3270
2001	3690
2002	2974
2003	3745
2004	3906
2005	5272
2006	2841