Year	Percent
1996-01-01	65.482700000000000
1997-01-01	56.442900000000000
1998-01-01	49.305200000000000
1999-01-01	55.287000000000000
2000-01-01	54.588000000000000
2001-01-01	52.226000000000006
2002-01-01	53.996600000000000
2003-01-01	56.666200000000000
2004-01-01	56.774400000000000
2005-01-01	58.778300000000000
2006-01-01	56.522300000000000
2007-01-01	61.200600000000000
2008-01-01	59.945500000000000
2009-01-01	56.985900000000000
2010-01-01	62.618000000000000
2011-01-01	69.460500000000000
2012-01-01	69.451700000000000
2013-01-01	65.360800000000000
2014-01-01	73.373800000000000