Year	Percent
2000-01-01	70.875
2001-01-01	70.375
2002-01-01	69.300
2003-01-01	70.450
2004-01-01	70.475
2005-01-01	70.675
2006-01-01	72.825
2007-01-01	73.225
2008-01-01	74.200
2009-01-01	74.025
2010-01-01	73.900
2011-01-01	74.750
2012-01-01	74.800
2013-01-01	75.100
2014-01-01	75.250
2015-01-01	76.675
2016-01-01	77.475
2017-01-01	78.825