Year	Cases per 100,000
1990	5.23
1991	5.1
1992	5.04
1993	5.02
1994	4.89
1995	4.77
1996	4.55
1997	4.37
1998	4.22
1999	4.12
2000	4.03
2001	4.07
2002	4.11
2003	4.14
2004	4.17
2005	4.08
2006	4.01
2007	3.94
2008	3.87
2009	3.81
2010	3.74
2011	3.68
2012	3.62
2013	3.56
2014	3.5
2015	3.44
2016	3.38