Year	Cases per 100,000
1990	18.84
1991	18.11
1992	17.59
1993	17.04
1994	16.53
1995	16.17
1996	16.11
1997	15.88
1998	15.57
1999	15.16
2000	14.81
2001	14.56
2002	14.52
2003	14.4
2004	14.05
2005	13.86
2006	13.77
2007	13.38
2008	13.3
2009	13.19
2010	13.15
2011	13.15
2012	13.27
2013	13.32
2014	13.53
2015	13.56
2016	13.64