Year	Percent
1996-01-01	98.535500000000000
1997-01-01	94.702900000000000
1998-01-01	94.266000000000000
1999-01-01	91.317400000000000
2000-01-01	90.546500000000000
2001-01-01	87.251000000000000
2002-01-01	80.327900000000000
2003-01-01	74.327600000000000
2004-01-01	72.660400000000000
2005-01-01	68.408300000000000
2006-01-01	68.237100000000000
2007-01-01	62.641800000000000
2008-01-01	60.668100000000000
2009-01-01	58.633999999999990
2010-01-01	59.989200000000000
2011-01-01	56.832500000000000
2012-01-01	56.348600000000000
2013-01-01	56.334300000000000
2014-01-01	59.770900000000000
2015-01-01	63.071999999999996
2016-01-01	64.781200000000000