Year	Cases per 100,000
1990	6.2
1991	8.7
1992	12
1993	16.2
1994	21
1995	26.3
1996	31.8
1997	37.1
1998	41.8
1999	45.7
2000	48.8
2001	51.1
2002	52.6
2003	53.7
2004	54.4
2005	54.9
2006	55.2
2007	55.4