Year	Cases per 100,000
1990	19.74
1991	19.13
1992	18.75
1993	18.49
1994	18.05
1995	17.72
1996	17.32
1997	16.62
1998	16.42
1999	15.97
2000	15.53
2001	15.28
2002	15.03
2003	14.76
2004	14.28
2005	13.87
2006	13.6
2007	13.3
2008	13.06
2009	12.86
2010	12.61
2011	12.48
2012	12.39
2013	12.27
2014	12.03
2015	11.95
2016	11.9