Year	Cases per 100,000
1990	19.68
1991	20.05
1992	20.23
1993	20.28
1994	20.07
1995	20.25
1996	20.01
1997	19.77
1998	19.43
1999	19.24
2000	18.87
2001	18.23
2002	17.87
2003	17.28
2004	17.21
2005	16.99
2006	16.64
2007	16.21
2008	15.86
2009	15.8
2010	15.16
2011	14.88
2012	14.44
2013	14.18
2014	14.24
2015	14.46
2016	14.66