Year Percent 1995-01-01 0.8452729999999999 1996-01-01 0.8003920000000000 1997-01-01 0.6178810000000000 1998-01-01 0.7397470000000000 1999-01-01 0.7591230000000000 2000-01-01 0.7335990000000000 2001-01-01 0.6036150000000000 2002-01-01 0.6306840000000000 2003-01-01 0.6201900000000000 2004-01-01 0.6581319999999999 2005-01-01 0.6657910000000000 2006-01-01 0.6548550000000000 2007-01-01 0.6605500000000000 2008-01-01 0.6671650000000000 2009-01-01 0.6164970000000001 2010-01-01 0.6350540000000000 2011-01-01 0.5919320000000000 2012-01-01 0.5865070000000000 2013-01-01 0.6102720000000000 2014-01-01 0.5786770000000000 2015-01-01 0.6223110000000000 2016-01-01 0.5999960000000000