Year	Percent
2000-01-01	51.150
2001-01-01	51.875
2002-01-01	55.800
2003-01-01	58.225
2004-01-01	59.150
2005-01-01	59.500
2006-01-01	60.425
2007-01-01	64.025
2008-01-01	65.875
2009-01-01	67.600
2010-01-01	67.350
2011-01-01	67.550
2012-01-01	70.625
2013-01-01	74.250
2014-01-01	75.475
2015-01-01	77.650
2016-01-01	78.250
2017-01-01	78.975