Year	Cases per 100,000
1990	16.81
1991	16.55
1992	16.22
1993	16.05
1994	15.96
1995	15.91
1996	15.85
1997	15.78
1998	15.81
1999	15.76
2000	15.35
2001	16.09
2002	15.78
2003	15.55
2004	15.5
2005	15.34
2006	15.26
2007	14.84
2008	14.41
2009	13.99
2010	13.84
2011	13.65
2012	13.52
2013	13.38
2014	13.24
2015	13.11
2016	13.02