Year	Cases per 100,000
1990	4.78
1991	4.72
1992	4.67
1993	4.61
1994	4.56
1995	4.52
1996	4.43
1997	4.35
1998	4.28
1999	4.27
2000	4.26
2001	4.19
2002	4.11
2003	4.04
2004	3.98
2005	3.92
2006	3.96
2007	3.99
2008	4.01
2009	4.03
2010	4.05
2011	4.1
2012	4.16
2013	4.22
2014	4.28
2015	4.34
2016	4.4