Year	Cases per 100,000
1990	19.04
1991	19.04
1992	19.06
1993	19.09
1994	19.12
1995	19.16
1996	19.04
1997	18.95
1998	18.86
1999	18.78
2000	18.72
2001	18.37
2002	18.05
2003	17.74
2004	17.44
2005	17.16
2006	16.78
2007	16.4
2008	16.05
2009	15.71
2010	15.4
2011	15.41
2012	15.44
2013	15.48
2014	15.54
2015	15.61
2016	15.7