Year Percent 2008-01-01 12.250420244813900 2009-01-01 1.559800981485360 2010-01-01 0.878936755572811 2011-01-01 0.877346595685083 2012-01-01 0.662268900269082 2013-01-01 1.101118363757060 2014-01-01 2.346268656716430 2015-01-01 4.069966083615980 2016-01-01 1.615925038702550 2017-01-01 1.968875568157990