Year	Cases per 100,000
1990	6.29
1991	6.24
1992	6.2
1993	6.17
1994	6.15
1995	6.13
1996	6.1
1997	6.06
1998	6.04
1999	6.01
2000	5.97
2001	5.93
2002	5.9
2003	5.86
2004	5.82
2005	5.78
2006	5.73
2007	5.73
2008	5.73
2009	5.74
2010	5.76
2011	5.81
2012	5.76
2013	5.72
2014	5.67
2015	5.62
2016	5.49