Year	Percent
2000-01-01	54.900
2001-01-01	53.150
2002-01-01	50.875
2003-01-01	50.400
2004-01-01	51.000
2005-01-01	52.375
2006-01-01	54.100
2007-01-01	56.350
2008-01-01	58.650
2009-01-01	58.500
2010-01-01	57.775
2011-01-01	58.275
2012-01-01	58.225
2013-01-01	58.175
2014-01-01	59.200
2015-01-01	59.825
2016-01-01	60.875
2017-01-01	62.025