Year	Percent
2005-01-01	73.8014979400868
2006-01-01	76.1100052440545
2007-01-01	77.1723082165897
2008-01-01	78.2081616058238
2009-01-01	76.7083175244461
2010-01-01	78.5243689502982
2011-01-01	79.8052901830347
2012-01-01	82.0683700596588
2013-01-01	83.1350748586312
2014-01-01	82.4986151198343
2015-01-01	82.8858185478993
2016-01-01	81.6271126094510
2017-01-01	82.7499476366979