Year	Percent
1996-01-01	58.442900000000000
1997-01-01	68.097700000000000
1998-01-01	68.458600000000000
1999-01-01	58.186000000000010
2000-01-01	57.444400000000000
2001-01-01	66.384800000000000
2002-01-01	66.466100000000000
2003-01-01	63.596000000000004
2004-01-01	62.425700000000000
2005-01-01	62.482400000000000
2006-01-01	59.424000000000000
2007-01-01	56.265300000000000
2008-01-01	58.807500000000000
2009-01-01	58.056900000000000
2010-01-01	55.103600000000000
2011-01-01	52.740000000000000
2012-01-01	50.942900000000000
2013-01-01	52.248500000000000
2014-01-01	51.613900000000000
2015-01-01	54.399400000000000
2016-01-01	52.570600000000000