Year	Cases per 100,000
1990	6.86
1991	6.66
1992	6.46
1993	6.27
1994	6.09
1995	5.92
1996	5.8
1997	5.69
1998	5.59
1999	5.49
2000	5.39
2001	5.39
2002	5.4
2003	5.41
2004	5.42
2005	5.44
2006	5.37
2007	5.29
2008	5.22
2009	5.15
2010	5.09
2011	5.04
2012	4.99
2013	4.95
2014	4.9
2015	4.86
2016	4.81