Year	Percent
2000-01-01	65.975
2001-01-01	67.125
2002-01-01	68.325
2003-01-01	68.700
2004-01-01	69.175
2005-01-01	69.975
2006-01-01	70.725
2007-01-01	72.250
2008-01-01	73.325
2009-01-01	74.050
2010-01-01	72.625
2011-01-01	72.875
2012-01-01	74.025
2013-01-01	74.425
2014-01-01	73.850
2015-01-01	74.675
2016-01-01	74.975
2017-01-01	75.225