Year	Cases per 100,000
1990	6.62
1991	6.56
1992	6.64
1993	6.67
1994	6.8
1995	6.86
1996	6.82
1997	6.85
1998	6.91
1999	6.71
2000	6.43
2001	6.08
2002	5.77
2003	5.68
2004	5.5
2005	5.36
2006	5.2
2007	5.1
2008	4.98
2009	4.9
2010	4.79
2011	4.69
2012	4.61
2013	4.58
2014	4.52
2015	4.44
2016	4.34