Year	Percent
2000-01-01	68.775
2001-01-01	69.175
2002-01-01	69.625
2003-01-01	68.850
2004-01-01	68.600
2005-01-01	68.500
2006-01-01	68.275
2007-01-01	69.400
2008-01-01	70.600
2009-01-01	69.750
2010-01-01	68.675
2011-01-01	68.625
2012-01-01	68.450
2013-01-01	68.325
2014-01-01	62.800
2015-01-01	62.250
2016-01-01	62.050
2017-01-01	61.450