Year	Cases per 100,000
1990	20.67
1991	20.62
1992	20.77
1993	20.91
1994	20.79
1995	20.66
1996	20.11
1997	19.93
1998	19.62
1999	18.99
2000	18.33
2001	17.91
2002	17.89
2003	17.67
2004	17.13
2005	16.98
2006	16.14
2007	15.39
2008	15.27
2009	14.76
2010	14.28
2011	13.75
2012	13.4
2013	13.35
2014	13.05
2015	12.75
2016	12.76