Year	Cases per 100,000
1990	9.22
1991	9.05
1992	9.02
1993	9.02
1994	9.03
1995	9.14
1996	9.13
1997	8.9
1998	8.49
1999	8.18
2000	8.08
2001	8.14
2002	8.11
2003	7.97
2004	7.7
2005	7.59
2006	7.42
2007	7.27
2008	7.33
2009	7.31
2010	7.06
2011	6.72
2012	6.7
2013	6.77
2014	6.75
2015	6.56
2016	6.51