Year Percent 2004-01-01 0.94944599999999990 2005-01-01 0.91670200000000000 2006-01-01 0.78243400000000000 2007-01-01 0.79018800000000000 2008-01-01 0.52548200000000000 2009-01-01 0.48860600000000004 2010-01-01 0.42584099999999997 2011-01-01 0.32761300000000000 2012-01-01 0.25957100000000000 2013-01-01 0.27213200000000004 2014-01-01 0.26662300000000000 2015-01-01 0.25413000000000000 2016-01-01 0.27141100000000000