Year	Percent
1996-01-01	95.1600
1997-01-01	95.9636
1998-01-01	97.4773
1999-01-01	98.0124
2000-01-01	95.0814
2001-01-01	81.3406
2002-01-01	68.3423
2003-01-01	64.3654
2004-01-01	57.5953
2005-01-01	59.3151
2006-01-01	55.3162
2007-01-01	54.6188
2008-01-01	54.4626
2009-01-01	52.8016
2010-01-01	49.4349
2011-01-01	53.2550
2012-01-01	54.8828
2013-01-01	58.2318
2014-01-01	60.8400
2015-01-01	71.1855
2016-01-01	66.6989