Year	Percent
2001-01-01	69.375
2002-01-01	70.400
2003-01-01	70.750
2004-01-01	71.225
2005-01-01	72.375
2006-01-01	72.325
2007-01-01	72.900
2008-01-01	73.400
2009-01-01	73.225
2010-01-01	74.025
2011-01-01	75.175
2012-01-01	76.275
2013-01-01	76.875
2014-01-01	76.450
2015-01-01	76.825
2016-01-01	77.450
2017-01-01	78.400