Year	Percent
2000-01-01	63.375
2001-01-01	64.600
2002-01-01	65.300
2003-01-01	67.425
2004-01-01	68.050
2005-01-01	68.275
2006-01-01	68.350
2007-01-01	68.925
2008-01-01	69.850
2009-01-01	70.275
2010-01-01	69.200
2011-01-01	68.375
2012-01-01	69.525
2013-01-01	70.625
2014-01-01	70.900
2015-01-01	71.350
2016-01-01	72.575
2017-01-01	72.150