Year	Percent
2000-01-01	61.800
2001-01-01	62.775
2002-01-01	63.100
2003-01-01	62.350
2004-01-01	61.900
2005-01-01	61.850
2006-01-01	62.750
2007-01-01	64.025
2008-01-01	64.725
2009-01-01	64.475
2010-01-01	62.175
2011-01-01	61.350
2012-01-01	61.200
2013-01-01	60.225
2014-01-01	59.650
2015-01-01	59.925
2016-01-01	60.225
2017-01-01	60.925