Year	Percent
2000-01-01	51.600
2001-01-01	52.350
2002-01-01	53.100
2003-01-01	53.600
2004-01-01	54.200
2005-01-01	55.950
2006-01-01	57.175
2007-01-01	61.325
2008-01-01	61.150
2009-01-01	60.400
2010-01-01	59.550
2011-01-01	59.325
2012-01-01	59.175
2013-01-01	59.775
2014-01-01	59.450
2015-01-01	59.450
2016-01-01	60.250
2017-01-01	60.375