Year	Cases per 100,000
1990	9.53
1991	9.23
1992	9
1993	8.83
1994	8.66
1995	8.55
1996	8.5
1997	8.53
1998	8.79
1999	7.96
2000	7.34
2001	6.86
2002	6.98
2003	6.97
2004	6.95
2005	7.02
2006	7.15
2007	7.15
2008	7.13
2009	7.06
2010	6.82
2011	6.95
2012	6.94
2013	7
2014	7.06
2015	7.1
2016	7.07