Year	Cases per 100,000
1990	19.51
1991	19.72
1992	18.93
1993	19.78
1994	19.59
1995	19.11
1996	17.59
1997	16.22
1998	15.97
1999	15.28
2000	14.76
2001	15.12
2002	14.46
2003	14.72
2004	14.26
2005	15.06
2006	15.27
2007	15.63
2008	15.91
2009	14.05
2010	13.96
2011	13.96
2012	13.89
2013	13.85
2014	13.32
2015	13.58
2016	13.71