Year Percent 2009-01-01 0.46048800000000000 2010-01-01 0.42888699999999996 2011-01-01 0.33854800000000000 2012-01-01 0.87080900000000000 2013-01-01 1.23558000000000000 2014-01-01 1.63641000000000010 2015-01-01 2.00306000000000000 2016-01-01 2.18640000000000000