Year	Percent
1999-01-01	62.650
2000-01-01	62.975
2001-01-01	63.250
2002-01-01	62.975
2003-01-01	62.125
2004-01-01	64.975
2005-01-01	66.100
2006-01-01	66.750
2007-01-01	66.575
2008-01-01	67.525
2009-01-01	67.850
2010-01-01	67.375
2011-01-01	66.450
2012-01-01	66.900
2013-01-01	66.600
2014-01-01	67.250
2015-01-01	67.950
2016-01-01	68.600
2017-01-01	71.225