Year	Cases per 100,000
1990	6.45
1991	6.44
1992	6.4
1993	6.37
1994	6.35
1995	6.34
1996	6.33
1997	6.33
1998	6.34
1999	6.31
2000	6.24
2001	6.25
2002	6.21
2003	6.13
2004	6.03
2005	5.91
2006	5.78
2007	5.67
2008	5.56
2009	5.48
2010	5.4
2011	5.32
2012	5.27
2013	5.14
2014	5.02
2015	4.96
2016	4.91