Year	Percent
2000-01-01	67.775
2001-01-01	67.600
2002-01-01	67.725
2003-01-01	67.825
2004-01-01	67.875
2005-01-01	68.075
2006-01-01	68.575
2007-01-01	68.400
2008-01-01	68.650
2009-01-01	68.525
2010-01-01	68.275
2011-01-01	68.300
2012-01-01	68.500
2013-01-01	68.750
2014-01-01	68.850
2015-01-01	68.950
2016-01-01	69.200
2017-01-01	69.275