Year	Percent
1996-01-01	74.9140
1997-01-01	73.9429
1998-01-01	73.9809
1999-01-01	72.6552
2000-01-01	71.8209
2001-01-01	71.7539
2002-01-01	74.1703
2003-01-01	75.0839
2004-01-01	74.9685
2005-01-01	74.4211
2006-01-01	74.1904
2007-01-01	73.9298
2008-01-01	73.6610
2009-01-01	73.2978
2010-01-01	72.5243
2011-01-01	74.0794
2012-01-01	74.5242
2013-01-01	74.2828
2014-01-01	75.1166
2015-01-01	82.0606
2016-01-01	68.6396