Year	Cases per 100,000
1990	20.94
1991	20.85
1992	20.77
1993	20.69
1994	20.61
1995	20.54
1996	20.16
1997	19.79
1998	19.44
1999	19.08
2000	18.74
2001	17.69
2002	16.7
2003	15.77
2004	14.9
2005	14.08
2006	13.6
2007	13.13
2008	12.69
2009	12.26
2010	11.86
2011	11.69
2012	11.52
2013	11.35
2014	11.19
2015	11.03
2016	10.88