Year	Percent
1996-01-01	67.3039
1997-01-01	59.4115
1998-01-01	56.9687
1999-01-01	55.6252
2000-01-01	59.0519
2001-01-01	57.3761
2002-01-01	61.8552
2003-01-01	64.4256
2004-01-01	64.3236
2005-01-01	59.1153
2006-01-01	54.1520
2007-01-01	50.0493
2008-01-01	54.9843
2009-01-01	52.9820
2010-01-01	61.2803
2011-01-01	63.7843
2012-01-01	60.0798
2013-01-01	65.8711
2014-01-01	66.5261
2015-01-01	73.1664
2016-01-01	71.1757