Year	Cases per 100,000
1990	4.45
1991	4.42
1992	4.39
1993	4.36
1994	4.34
1995	4.34
1996	4.33
1997	4.33
1998	4.36
1999	4.36
2000	4.28
2001	4.22
2002	4.2
2003	4.11
2004	4.03
2005	3.95
2006	3.88
2007	3.79
2008	3.74
2009	3.67
2010	3.57
2011	3.45
2012	3.35
2013	3.26
2014	3.16
2015	3.07
2016	3