Year	Cases per 100,000
1990	20.51
1991	19.81
1992	19.54
1993	19.26
1994	19.12
1995	18.87
1996	18.26
1997	17.51
1998	16.77
1999	16.27
2000	16.21
2001	15.94
2002	15.86
2003	15.56
2004	15.51
2005	15.44
2006	15.13
2007	15.15
2008	15.02
2009	15.07
2010	15.02
2011	14.82
2012	14.74
2013	14.55
2014	14.36
2015	14.19
2016	14.04