Year	Percent
2001-01-01	69.975
2002-01-01	71.250
2003-01-01	71.925
2004-01-01	72.700
2005-01-01	72.725
2006-01-01	72.850
2007-01-01	72.850
2008-01-01	72.775
2009-01-01	73.875
2010-01-01	74.750
2011-01-01	75.975
2012-01-01	76.975
2013-01-01	77.525
2014-01-01	78.200
2015-01-01	78.650
2016-01-01	79.700
2017-01-01	80.500