Year	Cases per 100,000
1990	8.44
1991	8.67
1992	8.79
1993	8.89
1994	8.89
1995	8.89
1996	8.94
1997	9.15
1998	9.19
1999	9.07
2000	9.01
2001	8.98
2002	8.9
2003	8.77
2004	8.51
2005	8.28
2006	8.02
2007	7.71
2008	7.52
2009	7.35
2010	7.16
2011	6.98
2012	6.86
2013	6.78
2014	6.69
2015	6.67
2016	6.65