Year	Percent
2000-01-01	57.600
2001-01-01	57.875
2002-01-01	58.175
2003-01-01	58.325
2004-01-01	58.625
2005-01-01	59.000
2006-01-01	59.100
2007-01-01	58.825
2008-01-01	59.100
2009-01-01	58.425
2010-01-01	58.050
2011-01-01	57.950
2012-01-01	58.100
2013-01-01	58.725
2014-01-01	59.750
2015-01-01	60.400
2016-01-01	61.025
2017-01-01	61.725