Year Percent 2009-01-01 27.0399 2010-01-01 25.9125 2011-01-01 25.1401 2012-01-01 28.1328 2013-01-01 28.4454 2014-01-01 37.2481 2015-01-01 37.4224 2016-01-01 26.5365