Year	Cases per 100,000
1990	20.69
1991	20.05
1992	19.61
1993	19.41
1994	19.17
1995	19.05
1996	18.62
1997	18.4
1998	18.18
1999	17.91
2000	17.77
2001	17.39
2002	17.02
2003	16.68
2004	16.33
2005	15.86
2006	15.33
2007	15.01
2008	14.71
2009	14.53
2010	14.3
2011	14.1
2012	13.8
2013	13.54
2014	13.35
2015	13.16
2016	13