Year	Cases per 100,000
1990	4
1991	3.91
1992	3.8
1993	3.79
1994	3.74
1995	3.62
1996	3.62
1997	3.58
1998	3.49
1999	3.4
2000	3.29
2001	3.34
2002	3.32
2003	3.31
2004	3.27
2005	3.26
2006	3.25
2007	3.21
2008	3.23
2009	3.28
2010	3.3
2011	3.18
2012	3.21
2013	3.08
2014	3.07
2015	3.02
2016	2.98