Year	Cases per 100,000
1990	13.56
1991	13.6
1992	13.64
1993	13.64
1994	13.66
1995	13.66
1996	13.67
1997	13.65
1998	13.64
1999	13.63
2000	13.65
2001	13.45
2002	13.28
2003	13.12
2004	12.98
2005	12.86
2006	12.74
2007	12.61
2008	12.49
2009	12.37
2010	12.27
2011	12.21
2012	12.15
2013	12.09
2014	12.03
2015	11.98
2016	11.93