Year	Percent
2005-01-01	77.200
2006-01-01	77.900
2007-01-01	78.600
2008-01-01	79.500
2009-01-01	79.000
2010-01-01	77.325
2011-01-01	78.350
2012-01-01	78.475
2013-01-01	78.400
2014-01-01	78.750
2015-01-01	79.200
2016-01-01	79.600
2017-01-01	79.800