Year Percent 2006-01-01 35.2000 2007-01-01 45.2000 2008-01-01 58.9000 2009-01-01 33.8000 2010-01-01 31.4000 2011-01-01 33.8249 2012-01-01 29.4560 2013-01-01 38.7763 2014-01-01 43.9027 2015-01-01 40.7871 2016-01-01 36.6672