Year Percent 2001-01-01 37.7000 2002-01-01 15.8000 2003-01-01 29.9000 2004-01-01 32.4000 2005-01-01 48.4000 2006-01-01 51.3000 2007-01-01 61.5000 2008-01-01 70.0000 2009-01-01 44.9000 2010-01-01 35.2510 2011-01-01 37.1561 2012-01-01 33.8107 2013-01-01 38.9187 2014-01-01 37.1939 2015-01-01 39.8326 2016-01-01 33.8827