Year	Percent
2005-01-01	80.0174043389606
2006-01-01	81.8230597554536
2007-01-01	80.2260437739469
2008-01-01	79.2907986761709
2009-01-01	78.6552627877809
2010-01-01	77.8821014892086
2011-01-01	77.3855498844125
2012-01-01	78.7697566370056
2013-01-01	78.1895095498847
2014-01-01	78.8513338454024
2015-01-01	78.1474670966396
2016-01-01	77.7708300896775
2017-01-01	78.2193549344662