Year	Percent
2000-01-01	70.7487155474222
2001-01-01	70.7630699684057
2002-01-01	70.5928595254216
2003-01-01	69.5450876202254
2004-01-01	69.2409682852150
2005-01-01	69.0302164720202
2006-01-01	69.4115478035076
2007-01-01	70.8242586027500
2008-01-01	71.8963413641988
2009-01-01	70.3933322070391
2010-01-01	69.2690158894414
2011-01-01	69.0348065771369
2012-01-01	69.1856958189564
2013-01-01	68.6444516773207