Year	Cases per 100,000
1990	18.7
1991	18.25
1992	18.56
1993	18.4
1994	18.41
1995	17.89
1996	17.41
1997	17.15
1998	17.05
1999	16.94
2000	16.7
2001	16.29
2002	16.27
2003	16.63
2004	16.46
2005	16.05
2006	15.46
2007	15.14
2008	15.6
2009	15.47
2010	15.26
2011	14.22
2012	14.25
2013	12.81
2014	12.18
2015	11.81
2016	11.53