Year Percent 1996-01-01 0.65813300000000000 1997-01-01 0.63152300000000000 1998-01-01 0.63466099999999990 1999-01-01 0.87884300000000000 2000-01-01 0.87460100000000010 2001-01-01 0.80723700000000000 2002-01-01 0.34225500000000003 2003-01-01 1.29357000000000000 2004-01-01 0.91385000000000000 2005-01-01 0.74870700000000000 2006-01-01 0.75926600000000000 2007-01-01 1.65869000000000020 2008-01-01 0.74129600000000000 2009-01-01 0.78276600000000000 2010-01-01 2.14635000000000000 2011-01-01 1.91155000000000000 2012-01-01 3.49079000000000000 2013-01-01 4.04304000000000000 2014-01-01 4.74660999999999960 2015-01-01 4.90376000000000000 2016-01-01 4.99784000000000000