Year	Percent
2000-01-01	66.5926785651806
2001-01-01	66.7740043643995
2002-01-01	67.1154014343000
2003-01-01	66.3049282202372
2004-01-01	66.0209609838644
2005-01-01	65.6447382908607
2006-01-01	65.9748523008763
2007-01-01	67.7048160339915
2008-01-01	68.9320451445967
2009-01-01	67.9237784712744
2010-01-01	66.6208678911528
2011-01-01	66.5765704842760
2012-01-01	66.6434812728635
2013-01-01	66.1190791276998