Year	Percent
2000-01-01	68.525
2001-01-01	68.875
2002-01-01	67.900
2003-01-01	67.575
2004-01-01	68.175
2005-01-01	69.025
2006-01-01	70.075
2007-01-01	72.575
2008-01-01	69.500
2009-01-01	61.375
2010-01-01	58.200
2011-01-01	57.000
2012-01-01	56.600
2013-01-01	58.675
2014-01-01	60.100
2015-01-01	61.675
2016-01-01	62.800
2017-01-01	63.700