Year	Percent
2001-01-01	63.300
2002-01-01	62.725
2003-01-01	62.125
2004-01-01	61.450
2005-01-01	61.975
2006-01-01	62.950
2007-01-01	63.825
2008-01-01	64.150
2009-01-01	61.475
2010-01-01	61.800
2011-01-01	62.450
2012-01-01	62.250
2013-01-01	62.575
2014-01-01	63.000
2015-01-01	63.225
2016-01-01	63.450
2017-01-01	64.350