Year	Percent
2000-01-01	50.275
2001-01-01	50.375
2002-01-01	51.350
2003-01-01	52.050
2004-01-01	52.225
2005-01-01	52.300
2006-01-01	53.400
2007-01-01	53.750
2008-01-01	53.375
2009-01-01	52.750
2010-01-01	52.425
2011-01-01	52.225
2012-01-01	51.850
2013-01-01	51.850
2014-01-01	51.500
2015-01-01	51.575
2016-01-01	51.650
2017-01-01	51.575