Year	Cases per 100,000
1990	6.62
1991	6.65
1992	6.68
1993	6.72
1994	6.75
1995	6.79
1996	6.68
1997	6.58
1998	6.47
1999	6.37
2000	6.27
2001	6.21
2002	6.16
2003	6.1
2004	6.05
2005	6.01
2006	5.85
2007	5.7
2008	5.56
2009	5.43
2010	5.3
2011	5.16
2012	5.02
2013	4.89
2014	4.76
2015	4.64
2016	4.52