Year	Cases per 100,000
1990	21.27
1991	21.2
1992	20.96
1993	20.43
1994	20.17
1995	20
1996	19.76
1997	19.35
1998	20.38
1999	19.86
2000	18.71
2001	18.3
2002	16.84
2003	16.61
2004	16.22
2005	16.27
2006	16.08
2007	16.01
2008	15.91
2009	15.62
2010	15.66
2011	15.5
2012	15.27
2013	15.38
2014	15.46
2015	15.54
2016	15.5