Year Percent 2001-01-01 36.7519 2002-01-01 45.5280 2003-01-01 56.5253 2004-01-01 63.8500 2005-01-01 88.5806 2006-01-01 76.5078 2007-01-01 77.9597 2008-01-01 69.8788 2009-01-01 71.7684 2010-01-01 78.0969 2011-01-01 76.1532 2012-01-01 42.5115 2013-01-01 76.3545 2014-01-01 85.8911 2015-01-01 84.9184 2016-01-01 79.7834