Year	Cases per 100,000
1990	9.09
1991	9.05
1992	8.99
1993	9.14
1994	9.31
1995	9.42
1996	9.55
1997	9.37
1998	9.25
1999	9
2000	8.75
2001	8.52
2002	8.25
2003	8.1
2004	7.92
2005	7.7
2006	7.48
2007	7.24
2008	7
2009	6.77
2010	6.54
2011	6.33
2012	6.15
2013	5.98
2014	5.8
2015	5.63
2016	5.49