Year	Cases per 100,000
1990	6.14
1991	6.15
1992	6.17
1993	6.18
1994	6.17
1995	6.17
1996	6.18
1997	6.2
1998	6.2
1999	6.13
2000	5.98
2001	5.81
2002	5.72
2003	5.73
2004	5.68
2005	5.67
2006	5.81
2007	5.87
2008	5.86
2009	5.78
2010	5.64
2011	5.54
2012	5.46
2013	5.53
2014	5.58
2015	5.62
2016	5.65