Year	Cases per 100,000
1990	6.32
1991	6.3
1992	6.32
1993	6.37
1994	6.21
1995	6.22
1996	6.21
1997	6.28
1998	6.28
1999	6.08
2000	5.97
2001	5.79
2002	5.76
2003	5.65
2004	5.53
2005	5.34
2006	5.19
2007	5.08
2008	5.03
2009	4.99
2010	4.95
2011	4.88
2012	4.81
2013	4.75
2014	4.69
2015	4.62
2016	4.55