Year	Percent
2005-01-01	37.6539478405490
2006-01-01	36.7065986944861
2007-01-01	36.6125671511124
2008-01-01	36.7871996442560
2009-01-01	36.6951220927955
2010-01-01	36.8618735873743
2011-01-01	36.5725563519588
2012-01-01	35.8279737908743
2013-01-01	35.8848796031564
2014-01-01	36.4101631136056
2015-01-01	36.3912651793694
2016-01-01	36.3851719690771
2017-01-01	36.6095267654215