Year	Cases per 100,000
1990	3.1
1991	3.11
1992	3.1
1993	3.11
1994	3.12
1995	3.12
1996	3.13
1997	3.15
1998	3.17
1999	3.2
2000	3.22
2001	3.2
2002	3.18
2003	3.16
2004	3.14
2005	3.13
2006	3.16
2007	3.19
2008	3.22
2009	3.26
2010	3.3
2011	3.31
2012	3.33
2013	3.35
2014	3.36
2015	3.38
2016	3.4