Year	Percent
2005-01-01	80.3076517679825
2006-01-01	80.7230718223873
2007-01-01	80.3217724744646
2008-01-01	79.9631517810121
2009-01-01	79.0201309663631
2010-01-01	78.7196288575223
2011-01-01	78.4762190238721
2012-01-01	78.8028166530696
2013-01-01	78.4897882883022
2014-01-01	78.2576722820124
2015-01-01	77.9856220945379
2016-01-01	77.7192357119662
2017-01-01	77.5808797240600