Year	Percent
2000-01-01	60.675
2001-01-01	60.525
2002-01-01	60.925
2003-01-01	60.950
2004-01-01	61.250
2005-01-01	61.625
2006-01-01	62.200
2007-01-01	61.900
2008-01-01	62.275
2009-01-01	62.475
2010-01-01	62.375
2011-01-01	62.525
2012-01-01	62.750
2013-01-01	63.200
2014-01-01	63.500
2015-01-01	63.700
2016-01-01	64.050
2017-01-01	64.425