Year	Percent
2000-01-01	76.350
2001-01-01	77.825
2002-01-01	79.125
2003-01-01	78.050
2004-01-01	78.625
2005-01-01	78.525
2006-01-01	79.750
2007-01-01	79.425
2008-01-01	78.375
2009-01-01	76.875
2010-01-01	74.125
2011-01-01	70.975
2012-01-01	68.725
2013-01-01	66.675
2014-01-01	64.850
2015-01-01	62.675
2016-01-01	61.000
2017-01-01	59.450