Year	Cases per 100,000
1990	17.79
1991	17.82
1992	17.91
1993	18.12
1994	18.43
1995	18.59
1996	18.71
1997	18.82
1998	18.9
1999	19.15
2000	19.39
2001	19.62
2002	19.56
2003	19.43
2004	19.31
2005	19.15
2006	18.96
2007	18.68
2008	18.44
2009	18.09
2010	17.74
2011	17.41
2012	17.04
2013	16.71
2014	16.42
2015	16.17
2016	15.98