Year	Percent
2000-01-01	76.325
2001-01-01	76.650
2002-01-01	75.425
2003-01-01	75.200
2004-01-01	75.950
2005-01-01	76.850
2006-01-01	77.850
2007-01-01	80.400
2008-01-01	77.025
2009-01-01	68.200
2010-01-01	64.900
2011-01-01	63.850
2012-01-01	63.675
2013-01-01	66.400
2014-01-01	68.300
2015-01-01	70.225
2016-01-01	71.850
2017-01-01	73.025