Year	Cases per 100,000
1990	540.8
1991	977.4
1992	890.2
1993	939.1
1994	1150
1995	1109
1996	1620
1997	1468
1998	776.7
1999	547.1
2000	765.8
2001	1956
2002	1577
2003	1616
2004	965.4
2005	536
2006	355.4