Year	Percent
2005-01-01	77.500
2006-01-01	77.600
2007-01-01	78.500
2008-01-01	80.600
2009-01-01	80.400
2010-01-01	77.925
2011-01-01	79.125
2012-01-01	79.875
2013-01-01	79.675
2014-01-01	80.675
2015-01-01	80.900
2016-01-01	81.275
2017-01-01	81.200