Year	Percent
1996-01-01	91.598400000000000
1997-01-01	86.845500000000000
1998-01-01	85.399300000000000
1999-01-01	78.738000000000000
2000-01-01	77.214300000000000
2001-01-01	77.235300000000000
2002-01-01	79.278000000000000
2003-01-01	71.818800000000000
2004-01-01	75.079700000000000
2005-01-01	63.227500000000000
2006-01-01	60.882200000000000
2007-01-01	62.894400000000000
2008-01-01	61.036100000000000
2009-01-01	62.553900000000000
2010-01-01	71.953800000000000
2011-01-01	58.874500000000000
2012-01-01	57.778700000000000
2013-01-01	53.641999999999996
2014-01-01	61.930000000000000
2015-01-01	49.356700000000000
2016-01-01	49.895000000000000