Year	Cases per 100,000
1990	8.76
1991	8.45
1992	8.18
1993	7.93
1994	7.84
1995	7.68
1996	7.49
1997	7.33
1998	7.25
1999	7.18
2000	7.16
2001	7.01
2002	6.95
2003	6.95
2004	6.7
2005	6.64
2006	6.55
2007	6.48
2008	6.5
2009	6.46
2010	6.27
2011	6.08
2012	5.96
2013	5.83
2014	5.71
2015	5.59
2016	5.5