Year Percent 1996-01-01 0.34419600000000000 1997-01-01 0.29089800000000000 1998-01-01 0.29522800000000005 1999-01-01 0.45532900000000000 2000-01-01 0.58083300000000000 2001-01-01 0.63384200000000000 2002-01-01 0.57410300000000000 2003-01-01 0.53951000000000000 2004-01-01 0.71771200000000000 2005-01-01 0.67225900000000000 2006-01-01 0.62799900000000000 2007-01-01 0.61810100000000000 2008-01-01 0.65159800000000000 2009-01-01 0.71658100000000000 2010-01-01 0.70748500000000000 2011-01-01 0.69618000000000000 2012-01-01 0.70996900000000000 2013-01-01 0.86793500000000000 2014-01-01 0.73988300000000000 2015-01-01 0.77870000000000000 2016-01-01 1.01837000000000000