Year	Percent
2000-01-01	50.975
2001-01-01	52.050
2002-01-01	54.925
2003-01-01	55.200
2004-01-01	56.275
2005-01-01	58.900
2006-01-01	60.950
2007-01-01	62.150
2008-01-01	65.000
2009-01-01	66.525
2010-01-01	64.250
2011-01-01	65.100
2012-01-01	65.100
2013-01-01	66.650
2014-01-01	67.650
2015-01-01	68.700
2016-01-01	70.950
2017-01-01	72.200