Year	Percent
2000-01-01	49.400
2001-01-01	50.375
2002-01-01	50.900
2003-01-01	51.250
2004-01-01	52.000
2005-01-01	53.725
2006-01-01	54.775
2007-01-01	58.300
2008-01-01	57.650
2009-01-01	54.650
2010-01-01	52.725
2011-01-01	51.900
2012-01-01	51.600
2013-01-01	52.350
2014-01-01	53.000
2015-01-01	54.125
2016-01-01	55.700
2017-01-01	56.575