Year	Percent
2000-01-01	76.175
2001-01-01	76.150
2002-01-01	76.450
2003-01-01	76.425
2004-01-01	76.675
2005-01-01	77.300
2006-01-01	77.575
2007-01-01	77.525
2008-01-01	78.200
2009-01-01	78.575
2010-01-01	78.575
2011-01-01	79.025
2012-01-01	79.275
2013-01-01	79.500
2014-01-01	79.950
2015-01-01	79.875
2016-01-01	80.150
2017-01-01	80.825