Year	Percent
2000-01-01	64.675
2001-01-01	66.050
2002-01-01	66.950
2003-01-01	67.175
2004-01-01	67.975
2005-01-01	69.600
2006-01-01	70.475
2007-01-01	72.350
2008-01-01	72.475
2009-01-01	72.575
2010-01-01	72.550
2011-01-01	72.675
2012-01-01	72.950
2013-01-01	74.025
2014-01-01	74.250
2015-01-01	74.500
2016-01-01	74.750
2017-01-01	75.775