Year	Cases per 100,000
1990	12.62
1991	13.27
1992	13.98
1993	14.74
1994	15.57
1995	16.48
1996	16.83
1997	17.2
1998	17.59
1999	17.98
2000	18.39
2001	18.21
2002	18.03
2003	17.87
2004	17.7
2005	17.55
2006	17.32
2007	17.1
2008	16.89
2009	16.68
2010	16.48
2011	16.37
2012	16.26
2013	16.16
2014	16.06
2015	15.96
2016	15.86