Year	Cases per 100,000
1990	20.41
1991	20.2
1992	20
1993	19.89
1994	19.29
1995	19.4
1996	19.73
1997	19.96
1998	20.46
1999	20.23
2000	20.04
2001	20.03
2002	19.99
2003	19.85
2004	19.69
2005	19.46
2006	19.27
2007	18.56
2008	18.31
2009	18.25
2010	17.77
2011	17.7
2012	18.43
2013	18.02
2014	17.89
2015	17.77
2016	17.69