Year	Percent
1996-01-01	53.5449
1997-01-01	53.8866
1998-01-01	66.4906
1999-01-01	60.3733
2000-01-01	65.7391
2001-01-01	66.3998
2002-01-01	67.6578
2003-01-01	67.2726
2004-01-01	68.7384
2005-01-01	72.9529
2006-01-01	72.1364
2007-01-01	72.3659
2008-01-01	72.8542
2009-01-01	76.6518
2010-01-01	78.1411
2011-01-01	78.6005
2012-01-01	77.3276
2013-01-01	73.3997
2014-01-01	73.9195
2015-01-01	69.0556
2016-01-01	66.9415