Year	Cases per 100,000
1990	23.7
1991	23.03
1992	22.27
1993	21.95
1994	21.71
1995	20.91
1996	20.12
1997	19.33
1998	18.7
1999	18.32
2000	17.75
2001	17.31
2002	16.77
2003	16.46
2004	16.19
2005	15.97
2006	15.73
2007	15.44
2008	15.19
2009	14.96
2010	14.82
2011	14.68
2012	14.5
2013	14.26
2014	14.03
2015	13.84
2016	13.69