Year Percent 2006-01-01 0.007431999999999999 2007-01-01 0.011625000000000000 2008-01-01 0.151493000000000020 2009-01-01 0.503695000000000000 2010-01-01 0.732935999999999900 2011-01-01 0.294025000000000000 2012-01-01 0.898049000000000000 2013-01-01 0.109233000000000000 2014-01-01 0.053124000000000000 2015-01-01 0.051661000000000000