Year	Percent
1996-01-01	65.7068
1997-01-01	52.5976
1998-01-01	63.7979
1999-01-01	67.8471
2000-01-01	79.8839
2001-01-01	79.0469
2002-01-01	81.3425
2003-01-01	78.2091
2004-01-01	77.5866
2005-01-01	77.8631
2006-01-01	80.0549
2007-01-01	76.9851
2008-01-01	77.9577
2009-01-01	75.8050
2010-01-01	73.4494
2011-01-01	76.4513
2012-01-01	70.8191
2013-01-01	71.5462
2014-01-01	72.1587
2015-01-01	74.4316
2016-01-01	72.0076