Year	Percent
2005-01-01	75.5785058311296
2006-01-01	75.7996448300508
2007-01-01	75.2141552518582
2008-01-01	73.7239252850456
2009-01-01	73.7442723975074
2010-01-01	69.5918546300777
2011-01-01	67.9759297405610
2012-01-01	68.3968453031152
2013-01-01	68.9281862532089
2014-01-01	69.4385421768311
2015-01-01	70.1336686809628
2016-01-01	70.7747512488401
2017-01-01	70.1828031605547