Year	Cases per 100,000
1990	6.21
1991	6.13
1992	6.05
1993	5.98
1994	5.91
1995	5.84
1996	5.63
1997	5.42
1998	5.22
1999	5.04
2000	4.85
2001	4.84
2002	4.82
2003	4.81
2004	4.8
2005	4.79
2006	4.76
2007	4.73
2008	4.7
2009	4.67
2010	4.64
2011	4.62
2012	4.6
2013	4.58
2014	4.56
2015	4.54
2016	4.53