Year Percent 2007-01-01 0.13631500000000002 2008-01-01 0.03558600000000000 2009-01-01 0.03715700000000000 2010-01-01 2.05592000000000000 2011-01-01 2.28835000000000000 2012-01-01 2.51030000000000000 2013-01-01 2.21773000000000000 2014-01-01 2.15965000000000000 2015-01-01 1.35858000000000000 2016-01-01 1.63621000000000000