Year	Percent
2005-01-01	76.6614187465966
2006-01-01	77.3681128752102
2007-01-01	77.3873600937175
2008-01-01	78.0661716502959
2009-01-01	77.3325433108832
2010-01-01	77.8429782360631
2011-01-01	78.5533806251207
2012-01-01	78.0306291114973
2013-01-01	78.0721818482142
2014-01-01	77.6243071477621
2015-01-01	77.6991841622622
2016-01-01	77.3517089771477
2017-01-01	77.6283242540052