Year	Cases per 100,000
1990	7.36
1991	7.31
1992	7.35
1993	7.36
1994	7.4
1995	7.39
1996	7.29
1997	7.26
1998	7.13
1999	6.97
2000	6.82
2001	6.72
2002	6.71
2003	6.66
2004	6.56
2005	6.5
2006	6.34
2007	6.16
2008	6.08
2009	6.02
2010	5.85
2011	5.79
2012	5.76
2013	5.85
2014	5.88
2015	5.85
2016	5.95