Year	Percent
1996-01-01	54.077700000000000
1997-01-01	65.163600000000000
1998-01-01	63.270300000000000
1999-01-01	66.499100000000000
2000-01-01	67.057700000000000
2001-01-01	73.333800000000000
2002-01-01	62.698400000000000
2003-01-01	61.828999999999990
2004-01-01	64.689500000000000
2005-01-01	59.113600000000000
2006-01-01	62.457100000000000
2007-01-01	59.680800000000000
2008-01-01	60.505800000000000
2009-01-01	60.827500000000000
2010-01-01	57.653999999999996
2011-01-01	57.528500000000000
2012-01-01	60.543400000000000
2013-01-01	59.144300000000000
2014-01-01	54.440900000000000