Year	Cases per 100,000
1990	4.02
1991	4.03
1992	4.05
1993	4.07
1994	4.09
1995	4.11
1996	4.11
1997	4.11
1998	4.1
1999	4.07
2000	4.06
2001	4.04
2002	4.03
2003	4.02
2004	4.01
2005	4
2006	3.98
2007	3.95
2008	3.93
2009	3.92
2010	3.9
2011	3.95
2012	3.99
2013	4.03
2014	4.08
2015	4.12
2016	4.15