Year	Cases per 100,000
1990	3.07
1991	3.07
1992	3.07
1993	3.08
1994	3.08
1995	3.09
1996	3.08
1997	3.09
1998	3.1
1999	3.11
2000	3.13
2001	3.11
2002	3.1
2003	3.09
2004	3.08
2005	3.07
2006	3.09
2007	3.11
2008	3.13
2009	3.15
2010	3.18
2011	3.18
2012	3.19
2013	3.19
2014	3.18
2015	3.18
2016	3.18