Year Percent 2010-01-01 4.2855700000000000 2011-01-01 1.8869999999999998 2012-01-01 3.8951700000000000 2013-01-01 2.8980700000000000 2014-01-01 1.7013800000000000 2015-01-01 1.8132599999999999 2016-01-01 2.3188200000000000