Year	Cases per 100,000
1990	6.4
1991	6.3
1992	6.29
1993	6.19
1994	6.11
1995	6.01
1996	5.91
1997	5.89
1998	5.86
1999	5.79
2000	5.66
2001	5.52
2002	5.38
2003	5.25
2004	5.17
2005	5.13
2006	5.03
2007	4.88
2008	4.7
2009	4.55
2010	4.41
2011	4.29
2012	4.2
2013	4.14
2014	4.09
2015	4.02
2016	3.96