Year	Cases per 100,000
1990	26.99
1991	25.16
1992	21.81
1993	19.6
1994	18.03
1995	17.54
1996	16.83
1997	16.28
1998	15.72
1999	15.21
2000	15.19
2001	15.35
2002	15.71
2003	15.55
2004	15.41
2005	15.91
2006	16.15
2007	16.32
2008	16.54
2009	16.58
2010	16.63
2011	16.19
2012	15.74
2013	15.37
2014	15
2015	14.71
2016	14.44