Year	Cases per 100,000
1990	4.7
1991	4.7
1992	4.65
1993	4.72
1994	4.65
1995	4.66
1996	4.59
1997	4.55
1998	4.54
1999	4.51
2000	4.46
2001	4.4
2002	4.37
2003	4.34
2004	4.32
2005	4.29
2006	4.27
2007	4.25
2008	4.22
2009	4.19
2010	4.16
2011	4.14
2012	4.11
2013	4.07
2014	4.03
2015	3.99
2016	3.94