Year	Percent
2000-01-01	71.675
2001-01-01	71.725
2002-01-01	71.225
2003-01-01	71.150
2004-01-01	71.675
2005-01-01	72.325
2006-01-01	73.400
2007-01-01	76.375
2008-01-01	75.225
2009-01-01	72.275
2010-01-01	70.175
2011-01-01	69.200
2012-01-01	68.750
2013-01-01	68.900
2014-01-01	68.850
2015-01-01	69.100
2016-01-01	69.050
2017-01-01	68.550