Year	Percent
2005-01-01	75.8
2006-01-01	76.5
2007-01-01	77.0
2008-01-01	77.0
2009-01-01	75.3
2010-01-01	75.2
2011-01-01	75.5
2012-01-01	75.6
2013-01-01	75.6
2014-01-01	76.0
2015-01-01	76.5
2016-01-01	77.1