Year	Cases per 100,000
1990	8.27
1991	8.16
1992	8.08
1993	8.03
1994	7.89
1995	7.77
1996	7.57
1997	7.39
1998	7.23
1999	7.07
2000	6.98
2001	6.63
2002	6.33
2003	6.05
2004	5.77
2005	5.74
2006	5.66
2007	5.58
2008	5.5
2009	5.42
2010	5.34
2011	5.27
2012	5.2
2013	5.14
2014	5.07
2015	5.01
2016	4.94