Year Percent 2003-01-01 0.49325699999999995 2004-01-01 0.47781400000000000 2005-01-01 0.42985800000000000 2006-01-01 0.31933200000000000 2007-01-01 0.35331700000000000 2008-01-01 0.31073600000000000 2009-01-01 0.40645000000000000 2010-01-01 0.37899200000000000 2011-01-01 0.27985200000000000 2012-01-01 0.60130200000000000 2013-01-01 0.56093600000000000 2014-01-01 0.51268800000000000 2015-01-01 0.63164800000000000