Year	Percent
1996-01-01	78.3403
1997-01-01	82.1318
1998-01-01	81.9000
1999-01-01	85.9643
2000-01-01	84.4989
2001-01-01	87.0626
2002-01-01	55.0583
2003-01-01	70.5658
2004-01-01	79.4262
2005-01-01	85.2812
2006-01-01	84.8950
2007-01-01	89.7775
2008-01-01	89.4542
2009-01-01	78.8189
2010-01-01	77.2228
2011-01-01	80.7819
2012-01-01	82.9491
2013-01-01	85.1617
2014-01-01	87.2677
2015-01-01	85.5063
2016-01-01	84.9624