Year	Cases per 100,000
1990	12
1991	11.59
1992	11.29
1993	11.01
1994	10.81
1995	10.53
1996	10.19
1997	9.99
1998	9.88
1999	9.7
2000	9.44
2001	9.23
2002	9.02
2003	8.78
2004	8.55
2005	8.38
2006	8.34
2007	8.24
2008	8.27
2009	8.24
2010	8.27
2011	8.24
2012	8.15
2013	8.04
2014	7.8
2015	7.65
2016	7.5