Year	Percent
2000-01-01	59.750
2001-01-01	59.675
2002-01-01	58.800
2003-01-01	58.100
2004-01-01	58.200
2005-01-01	58.625
2006-01-01	57.725
2007-01-01	57.600
2008-01-01	58.350
2009-01-01	59.225
2010-01-01	59.700
2011-01-01	60.050
2012-01-01	60.525
2013-01-01	60.725
2014-01-01	61.175
2015-01-01	61.075
2016-01-01	61.375
2017-01-01	61.600