Year	Percent
1996-01-01	93.7644
1997-01-01	81.3938
1998-01-01	80.4651
1999-01-01	79.7473
2000-01-01	68.1801
2001-01-01	55.0957
2002-01-01	49.8934
2003-01-01	72.3070
2004-01-01	71.9145
2005-01-01	81.1207
2006-01-01	73.9229
2007-01-01	77.5305
2008-01-01	76.7281
2009-01-01	75.0279
2010-01-01	76.6918
2011-01-01	78.2950
2012-01-01	79.9613
2013-01-01	79.4854
2014-01-01	79.6575
2015-01-01	86.6057
2016-01-01	88.1691