Year	Cases per 100,000
1990	16.42
1991	16.92
1992	17.5
1993	18.34
1994	18.56
1995	19.05
1996	18.71
1997	18.61
1998	18.15
1999	18.12
2000	17.66
2001	17.85
2002	18.58
2003	18.42
2004	18.62
2005	18.77
2006	18.49
2007	18.08
2008	17.96
2009	17.96
2010	17.81
2011	17.92
2012	16.58
2013	16.21
2014	15.55
2015	15.04
2016	14.74