Year Percent 1996-01-01 0.26553400000000000 1997-01-01 0.38306599999999996 1998-01-01 0.41271499999999994 1999-01-01 0.47585299999999997 2000-01-01 0.57870000000000000 2001-01-01 0.30969100000000000 2002-01-01 0.30158200000000000 2003-01-01 0.41566000000000003 2004-01-01 0.58699300000000000 2005-01-01 0.63979700000000010 2006-01-01 1.65867000000000000 2007-01-01 1.13077000000000000 2008-01-01 0.35959700000000000 2009-01-01 0.33618600000000004 2010-01-01 0.37555400000000000 2011-01-01 0.26360800000000000 2012-01-01 0.35700900000000000 2013-01-01 -0.06200599999999999 2014-01-01 0.36100000000000000 2015-01-01 0.52909100000000000 2016-01-01 0.37814300000000000