Year	Percent
2001-01-01	62.450
2002-01-01	62.375
2003-01-01	62.225
2004-01-01	62.075
2005-01-01	62.850
2006-01-01	63.325
2007-01-01	63.675
2008-01-01	63.950
2009-01-01	63.300
2010-01-01	63.275
2011-01-01	63.700
2012-01-01	63.925
2013-01-01	64.300
2014-01-01	64.725
2015-01-01	64.825
2016-01-01	64.950
2017-01-01	65.575