Year	Percent
1996-01-01	62.475000000000000
1997-01-01	55.352500000000000
1998-01-01	51.141000000000005
1999-01-01	71.473500000000000
2000-01-01	59.509700000000000
2001-01-01	50.000000000000000
2002-01-01	67.071100000000000
2003-01-01	65.456500000000000
2004-01-01	63.890600000000000
2005-01-01	62.728100000000000
2006-01-01	60.477500000000000
2007-01-01	61.869300000000000
2008-01-01	69.903100000000000
2009-01-01	59.457100000000000
2010-01-01	57.470300000000000
2011-01-01	59.750100000000000
2012-01-01	58.907100000000000
2013-01-01	55.722500000000000
2014-01-01	60.298300000000000