Year	Cases per 100,000
1990	9.35
1991	9.25
1992	9.16
1993	9.08
1994	9
1995	8.92
1996	8.97
1997	9.03
1998	9.09
1999	9.14
2000	9.21
2001	9.17
2002	9.14
2003	9.1
2004	9.07
2005	9.05
2006	8.92
2007	8.8
2008	8.68
2009	8.56
2010	8.46
2011	8.38
2012	8.3
2013	8.23
2014	8.16
2015	8.09
2016	8.02