Year Percent 1996-01-01 0.8655160000000000 1997-01-01 0.9464080000000000 1998-01-01 0.7240520000000000 1999-01-01 0.6732640000000001 2000-01-01 1.2969600000000001 2001-01-01 0.8468559999999999 2002-01-01 0.7240040000000000 2003-01-01 1.1033899999999999 2004-01-01 1.0490000000000002 2005-01-01 1.3022200000000002 2006-01-01 1.3181600000000000 2007-01-01 0.9630549999999999 2008-01-01 -0.5181680000000001 2009-01-01 1.4684100000000000 2010-01-01 0.9645790000000001 2011-01-01 0.5648489999999999 2012-01-01 1.3498400000000000 2013-01-01 1.0229500000000000 2014-01-01 0.7338290000000000 2015-01-01 0.6347170000000000 2016-01-01 0.8399420000000000