Year	Percent
2005-01-01	83.6495478152182
2006-01-01	84.2064068161794
2007-01-01	83.7977003839722
2008-01-01	83.4340031032241
2009-01-01	82.6808338807535
2010-01-01	82.4478645762432
2011-01-01	82.3616254188638
2012-01-01	82.7200057594149
2013-01-01	82.4374152937846
2014-01-01	82.2050009761948
2015-01-01	81.9622017014214
2016-01-01	81.8449385130166
2017-01-01	81.7783866940969