Year	Cases per 100,000
1990	19.95
1991	19.4
1992	19.1
1993	18.32
1994	17.98
1995	17.03
1996	16.58
1997	16.36
1998	16.33
1999	16.58
2000	16.75
2001	16.78
2002	16.82
2003	16.65
2004	16.36
2005	15.92
2006	15.03
2007	14.61
2008	14.64
2009	13.64
2010	12.74
2011	12.14
2012	11.66
2013	11.27
2014	11.05
2015	10.89
2016	10.76