Year	Percent
2000-01-01	50.125
2001-01-01	48.750
2002-01-01	47.025
2003-01-01	46.650
2004-01-01	47.100
2005-01-01	48.200
2006-01-01	49.675
2007-01-01	52.025
2008-01-01	54.175
2009-01-01	54.375
2010-01-01	53.950
2011-01-01	54.225
2012-01-01	54.400
2013-01-01	54.425
2014-01-01	55.625
2015-01-01	56.500
2016-01-01	57.550
2017-01-01	58.575