Year	Percent
1996-01-01	80.5706
1997-01-01	80.4110
1998-01-01	79.5336
1999-01-01	78.3189
2000-01-01	78.2834
2001-01-01	85.0712
2002-01-01	86.1833
2003-01-01	85.6668
2004-01-01	84.8107
2005-01-01	81.9079
2006-01-01	80.5764
2007-01-01	80.7454
2008-01-01	81.1202
2009-01-01	80.2715
2010-01-01	81.6791
2011-01-01	81.9322
2012-01-01	81.5586
2013-01-01	81.2826
2014-01-01	81.0070
2015-01-01	81.4551
2016-01-01	86.6028