Year Percent 2011-01-01 11.427999999999999 2012-01-01 11.427999999999999 2013-01-01 11.427999999999999 2014-01-01 17.704000000000000 2015-01-01 17.704000000000000 2016-01-01 17.704000000000000 2017-01-01 19.529400000000000