Year	Cases per 100,000
1990	4.08
1991	4.1
1992	4.13
1993	4.15
1994	4.18
1995	4.21
1996	4.21
1997	4.22
1998	4.24
1999	4.25
2000	4.26
2001	4.25
2002	4.25
2003	4.25
2004	4.24
2005	4.25
2006	4.24
2007	4.23
2008	4.23
2009	4.22
2010	4.23
2011	4.2
2012	4.19
2013	4.17
2014	4.15
2015	4.14
2016	4.13