Year	Cases per 100,000
1990	20.24
1991	19.91
1992	19.56
1993	19.19
1994	18.84
1995	18.46
1996	18.07
1997	17.67
1998	17.32
1999	16.91
2000	16.62
2001	16.39
2002	15.9
2003	15.63
2004	15.32
2005	15.06
2006	14.79
2007	14.47
2008	14.16
2009	13.83
2010	13.49
2011	13.11
2012	12.84
2013	12.58
2014	12.28
2015	12
2016	11.77