Year	Percent
2003-01-01	78.850
2004-01-01	76.625
2005-01-01	79.625
2006-01-01	79.775
2007-01-01	79.850
2008-01-01	77.200
2009-01-01	75.975
2010-01-01	76.375
2011-01-01	76.300
2012-01-01	75.000
2013-01-01	75.050
2014-01-01	80.825
2015-01-01	80.500
2016-01-01	79.400
2017-01-01	78.650