Year	Percent
2001-01-01	73.050
2002-01-01	74.225
2003-01-01	74.925
2004-01-01	75.600
2005-01-01	76.375
2006-01-01	76.025
2007-01-01	76.225
2008-01-01	76.500
2009-01-01	77.775
2010-01-01	79.300
2011-01-01	79.850
2012-01-01	80.900
2013-01-01	81.675
2014-01-01	81.525
2015-01-01	81.775
2016-01-01	82.525
2017-01-01	83.200