Year	Cases per 100,000
1990	17.78
1991	17.62
1992	17.41
1993	17.19
1994	16.95
1995	16.71
1996	16.5
1997	16.35
1998	16.23
1999	16.08
2000	16.08
2001	16.13
2002	16.23
2003	16.32
2004	16.38
2005	16.4
2006	16.35
2007	16.25
2008	16.11
2009	16
2010	15.84
2011	15.62
2012	15.4
2013	15.2
2014	15.01
2015	14.83
2016	14.63