Year Percent 2011-01-01 46.942100000000000 2012-01-01 46.942100000000000 2013-01-01 46.942100000000000 2014-01-01 52.713700000000000 2015-01-01 52.713700000000000 2016-01-01 52.713700000000000 2017-01-01 55.306000000000004