Year	Cases per 100,000
1990	4.18
1991	4.17
1992	4.18
1993	4.19
1994	4.22
1995	4.25
1996	4.27
1997	4.28
1998	4.29
1999	4.23
2000	4.16
2001	4.08
2002	4.01
2003	3.96
2004	3.92
2005	3.86
2006	3.8
2007	3.77
2008	3.72
2009	3.66
2010	3.59
2011	3.53
2012	3.46
2013	3.41
2014	3.36
2015	3.3
2016	3.24