Year	Percent
1996-01-01	63.7204
1997-01-01	65.3329
1998-01-01	69.9601
1999-01-01	68.0217
2000-01-01	68.6389
2001-01-01	67.0763
2002-01-01	66.9793
2003-01-01	67.8524
2004-01-01	67.1381
2005-01-01	64.0602
2006-01-01	65.3666
2007-01-01	65.3130
2008-01-01	65.4313
2009-01-01	66.9148
2010-01-01	68.0545
2011-01-01	66.2018
2012-01-01	67.5155
2013-01-01	67.4282
2014-01-01	69.5365
2015-01-01	66.7751
2016-01-01	67.7267