Year	Cases per 100,000
1990	20.61
1991	20.35
1992	20.04
1993	19.71
1994	19.33
1995	18.9
1996	18.4
1997	17.95
1998	17.52
1999	17.1
2000	16.67
2001	16.2
2002	15.76
2003	15.28
2004	14.81
2005	14.34
2006	13.87
2007	13.43
2008	13.08
2009	12.79
2010	12.51
2011	12.22
2012	11.95
2013	11.72
2014	11.51
2015	11.33
2016	11.14