Year	Percent
1999-01-01	71.000
2000-01-01	70.950
2001-01-01	71.625
2002-01-01	71.050
2003-01-01	71.050
2004-01-01	71.200
2005-01-01	71.250
2006-01-01	71.125
2007-01-01	70.650
2008-01-01	71.200
2009-01-01	71.075
2010-01-01	70.775
2011-01-01	71.075
2012-01-01	71.450
2013-01-01	71.225
2014-01-01	71.375
2015-01-01	71.050
2016-01-01	71.375
2017-01-01	71.075