Year	Percent
2005-01-01	71.0829051506689
2006-01-01	72.0040808702357
2007-01-01	72.3477720194356
2008-01-01	72.5814443921298
2009-01-01	70.0486163050245
2010-01-01	72.0575382028860
2011-01-01	73.5995363321433
2012-01-01	73.6130303963446
2013-01-01	73.7589956172221
2014-01-01	72.7614671474176
2015-01-01	72.9967480380891
2016-01-01	72.3686331405516
2017-01-01	72.4676208663320