Year	Cases per 100,000
1990	9.59
1991	9.47
1992	9.37
1993	9.31
1994	9.36
1995	9.36
1996	9.17
1997	9.02
1998	8.9
1999	8.76
2000	8.53
2001	8.2
2002	7.82
2003	7.49
2004	7.21
2005	6.97
2006	6.64
2007	6.33
2008	5.99
2009	5.75
2010	5.59
2011	5.42
2012	5.25
2013	5.09
2014	4.94
2015	4.81
2016	4.69