Year	Cases per 100,000
1990	1632
1991	9766
1992	13000
1993	13670
1994	13510
1995	14940
1996	15430
1997	10520
1998	10660
1999	29620
2000	45850
2001	49210
2002	37580
2003	30980
2004	23130
2005	30050
2006	26450