Year	Cases per 100,000
1990	5.81
1991	5.82
1992	5.83
1993	5.83
1994	5.66
1995	5.61
1996	5.58
1997	5.55
1998	5.57
1999	5.48
2000	5.49
2001	5.38
2002	5.39
2003	5.26
2004	5.12
2005	4.97
2006	4.86
2007	4.72
2008	4.6
2009	4.52
2010	4.43
2011	4.33
2012	4.22
2013	4.13
2014	4.04
2015	3.98
2016	3.96