Year	Cases per 100,000
1990	6.19
1991	6.19
1992	6.19
1993	6.18
1994	6.18
1995	6.18
1996	6.01
1997	5.84
1998	5.68
1999	5.52
2000	5.38
2001	5.36
2002	5.36
2003	5.35
2004	5.35
2005	5.35
2006	5.3
2007	5.26
2008	5.22
2009	5.18
2010	5.15
2011	5.14
2012	5.14
2013	5.13
2014	5.13
2015	5.13
2016	5.12