Year	Cases per 100,000
1990	5.75
1991	5.72
1992	5.68
1993	5.65
1994	5.64
1995	5.62
1996	5.59
1997	5.58
1998	5.53
1999	5.37
2000	5.22
2001	5.05
2002	4.8
2003	4.63
2004	4.42
2005	4.27
2006	4.15
2007	4
2008	3.98
2009	3.9
2010	3.85
2011	3.84
2012	3.8
2013	3.76
2014	3.71
2015	3.66
2016	3.62