Year	Percent
2005-01-01	93.8879162749884
2006-01-01	94.0372874303132
2007-01-01	93.9361211906531
2008-01-01	93.9074218886026
2009-01-01	93.6187781110544
2010-01-01	92.4906911916677
2011-01-01	92.8997931289108
2012-01-01	92.5094494591674
2013-01-01	92.3291886030527
2014-01-01	91.7146193894886
2015-01-01	91.7782392322213
2016-01-01	91.4266683822895
2017-01-01	91.2690101034635