Year	Percent
1996-01-01	82.9174
1997-01-01	81.7235
1998-01-01	82.8993
1999-01-01	81.6182
2000-01-01	81.0660
2001-01-01	85.3065
2002-01-01	84.8759
2003-01-01	83.8243
2004-01-01	77.9999
2005-01-01	78.9082
2006-01-01	76.8607
2007-01-01	79.0304
2008-01-01	80.8706
2009-01-01	76.5648
2010-01-01	77.4956
2011-01-01	77.1010
2012-01-01	75.4077
2013-01-01	76.7568
2014-01-01	75.8344
2015-01-01	78.6447
2016-01-01	78.5427