Year Percent 1995-01-01 0.19625300000000000 1996-01-01 0.16103800000000001 1997-01-01 0.14375000000000000 1998-01-01 0.14776900000000000 1999-01-01 0.16871200000000000 2000-01-01 0.16581700000000002 2001-01-01 0.18993700000000000 2002-01-01 0.26654800000000000 2003-01-01 0.37265800000000000 2004-01-01 0.37307900000000000 2005-01-01 0.39852500000000000 2006-01-01 0.54428400000000000 2007-01-01 0.69259700000000000 2008-01-01 0.41703100000000004 2009-01-01 0.52022800000000000 2010-01-01 0.55812900000000000 2011-01-01 0.51981199999999990 2012-01-01 0.49958199999999997 2013-01-01 0.51865100000000000 2014-01-01 0.58701000000000000 2015-01-01 0.62946000000000000 2016-01-01 0.56663000000000000