Year Percent 1995-01-01 0.43125900000000000 1996-01-01 0.45641700000000000 1997-01-01 0.46796899999999997 1998-01-01 0.47895100000000000 1999-01-01 0.49312300000000000 2000-01-01 0.49718800000000000 2001-01-01 0.53246300000000000 2002-01-01 0.53069000000000000 2003-01-01 0.58231400000000000 2004-01-01 0.59869500000000000 2005-01-01 0.60398400000000000 2006-01-01 0.58204100000000000 2007-01-01 0.57857400000000000 2008-01-01 0.53534600000000000 2009-01-01 0.49645500000000004 2010-01-01 0.55587000000000000 2011-01-01 0.53737200000000010 2012-01-01 0.49451500000000000 2013-01-01 0.48046200000000000 2014-01-01 0.45577100000000000 2015-01-01 0.47907700000000003