Year	Cases per 100,000
1990	20.45
1991	19.69
1992	18.97
1993	18.28
1994	17.62
1995	17
1996	17
1997	17.02
1998	17.04
1999	17.06
2000	17.09
2001	17.03
2002	16.98
2003	16.93
2004	16.88
2005	16.85
2006	16.83
2007	16.8
2008	16.79
2009	16.77
2010	16.77
2011	16.76
2012	16.78
2013	16.79
2014	16.8
2015	16.81
2016	16.84