Year	Cases per 100,000
1990	17.53
1991	18.04
1992	17.45
1993	18.57
1994	18.88
1995	18.81
1996	17.99
1997	17.17
1998	17.03
1999	16.26
2000	16.08
2001	16.69
2002	16.12
2003	16.16
2004	15.98
2005	16.43
2006	16.84
2007	17.13
2008	17.15
2009	15.04
2010	14.97
2011	14.67
2012	13.81
2013	13.29
2014	12.19
2015	12.21
2016	12.09