Year	Cases per 100,000
1990	9.7
1991	9.55
1992	9.4
1993	9.25
1994	9.11
1995	8.98
1996	8.45
1997	7.97
1998	7.51
1999	7.08
2000	6.68
2001	6.39
2002	6.12
2003	5.86
2004	5.62
2005	5.38
2006	5.29
2007	5.19
2008	5.1
2009	5.01
2010	4.92
2011	4.95
2012	4.99
2013	5.02
2014	5.06
2015	5.09
2016	5.13