Year Percent 2011-01-01 2.339260000000000 2012-01-01 2.339260000000000 2013-01-01 2.339260000000000 2014-01-01 4.332330000000001 2015-01-01 4.332330000000001 2016-01-01 4.332330000000001 2017-01-01 5.117310000000000