Year Percent 1996-01-01 0.7681190000000000 1997-01-01 0.6870410000000000 1998-01-01 0.7131760000000000 1999-01-01 0.6535650000000000 2000-01-01 0.6194550000000000 2001-01-01 0.6737989999999999 2002-01-01 0.6945710000000000 2003-01-01 0.7253820000000000 2004-01-01 0.7202390000000001 2005-01-01 0.6582620000000000 2006-01-01 0.8215590000000000 2007-01-01 0.7652399999999999 2008-01-01 0.8906180000000000 2009-01-01 0.8870100000000001 2010-01-01 0.7545860000000000 2011-01-01 0.7868510000000000 2012-01-01 0.8543550000000000 2013-01-01 0.8561320000000000 2014-01-01 0.8406399999999999 2015-01-01 0.7088439999999999 2016-01-01 0.7490630000000000