Year	Percent
2005-01-01	77.800
2006-01-01	77.100
2007-01-01	78.400
2008-01-01	78.900
2009-01-01	79.500
2010-01-01	78.350
2011-01-01	79.275
2012-01-01	79.425
2013-01-01	79.975
2014-01-01	79.125
2015-01-01	80.200
2016-01-01	80.700
2017-01-01	82.025