Year Percent 1996-01-01 0.7093820000000000 1997-01-01 0.7133729999999999 1998-01-01 0.6038660000000000 1999-01-01 0.6724670000000000 2000-01-01 0.8028450000000000 2001-01-01 0.7856320000000000 2002-01-01 0.9145350000000000 2003-01-01 0.9288580000000000 2004-01-01 0.9471629999999999 2005-01-01 0.9215559999999999 2006-01-01 0.8890100000000001 2007-01-01 0.8653379999999999 2008-01-01 0.7812439999999999 2009-01-01 0.8371970000000000 2010-01-01 0.8146970000000000 2011-01-01 0.7927970000000000 2012-01-01 0.7668680000000000 2013-01-01 0.7200540000000000 2014-01-01 0.7179010000000000 2015-01-01 0.8180020000000000 2016-01-01 0.7569819999999999