Year	Cases per 100,000
1990	3.13
1991	3.12
1992	3.12
1993	3.11
1994	3.11
1995	3.11
1996	3.16
1997	3.21
1998	3.25
1999	3.32
2000	3.38
2001	3.32
2002	3.25
2003	3.25
2004	3.23
2005	3.2
2006	3.17
2007	3.11
2008	3.1
2009	3.11
2010	3.05
2011	3.01
2012	2.99
2013	2.97
2014	2.96
2015	2.94
2016	2.93