Year	Cases per 100,000
1990	15.16
1991	15.75
1992	16.35
1993	16.95
1994	17.58
1995	18.31
1996	17.48
1997	16.73
1998	16.04
1999	15.41
2000	14.82
2001	14.31
2002	13.86
2003	13.47
2004	13.12
2005	12.79
2006	12.69
2007	12.58
2008	12.48
2009	12.37
2010	12.29
2011	12.14
2012	12.01
2013	11.89
2014	11.77
2015	11.67
2016	11.57