Year	Cases per 100,000
1990	7.98
1991	7.91
1992	7.84
1993	7.78
1994	7.72
1995	7.66
1996	7.3
1997	6.97
1998	6.66
1999	6.36
2000	6.08
2001	5.75
2002	5.44
2003	5.15
2004	4.88
2005	4.62
2006	4.42
2007	4.22
2008	4.03
2009	3.85
2010	3.68
2011	3.63
2012	3.58
2013	3.53
2014	3.49
2015	3.44
2016	3.4