Year	Percent
2005-01-01	77.500
2006-01-01	78.200
2007-01-01	79.200
2008-01-01	79.000
2009-01-01	77.900
2010-01-01	76.550
2011-01-01	77.225
2012-01-01	76.975
2013-01-01	76.350
2014-01-01	76.325
2015-01-01	76.475
2016-01-01	76.625
2017-01-01	77.150