Year	Percent
2001-01-01	58.400
2002-01-01	58.475
2003-01-01	58.400
2004-01-01	58.275
2005-01-01	58.750
2006-01-01	59.250
2007-01-01	59.675
2008-01-01	59.800
2009-01-01	59.375
2010-01-01	58.950
2011-01-01	59.675
2012-01-01	60.075
2013-01-01	60.475
2014-01-01	60.875
2015-01-01	61.325
2016-01-01	61.475
2017-01-01	62.050