Year Percent 2011-01-01 1.6074700000000002 2012-01-01 1.6074700000000002 2013-01-01 1.6074700000000002 2014-01-01 5.3320200000000000 2015-01-01 5.3320200000000000 2016-01-01 5.3320200000000000 2017-01-01 4.5297100000000000