Year	Percent
2000-01-01	59.400
2001-01-01	61.650
2002-01-01	62.500
2003-01-01	62.975
2004-01-01	61.175
2005-01-01	60.875
2006-01-01	62.150
2007-01-01	64.500
2008-01-01	64.725
2009-01-01	65.000
2010-01-01	65.550
2011-01-01	66.850
2012-01-01	67.500
2013-01-01	67.900
2014-01-01	69.200
2015-01-01	69.800
2016-01-01	70.325
2017-01-01	69.375