Year Percent 1996-01-01 0.36036599999999996 1997-01-01 0.39661599999999997 1998-01-01 0.59789100000000000 1999-01-01 0.61287200000000000 2000-01-01 0.33326600000000000 2001-01-01 0.64200400000000000 2002-01-01 0.63121800000000010 2003-01-01 0.56720700000000000 2004-01-01 1.40095000000000000 2005-01-01 0.58361800000000010 2006-01-01 0.96872500000000000 2007-01-01 1.03657000000000000 2008-01-01 0.82795800000000000 2009-01-01 0.69183300000000000 2010-01-01 0.56111300000000000 2011-01-01 0.08332100000000000 2012-01-01 -1.37869000000000000 2013-01-01 0.13100100000000000 2014-01-01 0.31263900000000000 2015-01-01 0.38655200000000000 2016-01-01 0.20108600000000000