Year Percent 1996-01-01 29.6953 1997-01-01 37.1050 1998-01-01 31.2500 1999-01-01 35.0000 2000-01-01 35.4839 2001-01-01 37.2093 2002-01-01 35.5556 2003-01-01 40.0000 2004-01-01 41.6667 2005-01-01 35.4839 2006-01-01 33.4677 2007-01-01 34.2105 2008-01-01 37.8049 2009-01-01 37.3898 2010-01-01 29.7606 2011-01-01 38.0396 2012-01-01 36.7918 2013-01-01 32.5676 2014-01-01 35.6009