Year	Percent
1999-01-01	60.750
2000-01-01	61.000
2001-01-01	61.525
2002-01-01	61.150
2003-01-01	60.350
2004-01-01	62.825
2005-01-01	63.525
2006-01-01	63.750
2007-01-01	64.175
2008-01-01	64.300
2009-01-01	64.350
2010-01-01	64.300
2011-01-01	63.125
2012-01-01	62.975
2013-01-01	62.900
2014-01-01	63.425
2015-01-01	63.325
2016-01-01	62.775
2017-01-01	64.875