Year	Percent
1996-01-01	92.84290000000000
1997-01-01	91.62110000000000
1998-01-01	87.25620000000000
1999-01-01	87.89240000000000
2000-01-01	71.70010000000000
2001-01-01	69.54570000000000
2002-01-01	71.08040000000000
2003-01-01	70.15130000000000
2004-01-01	71.09910000000000
2005-01-01	72.56750000000000
2006-01-01	76.09190000000000
2007-01-01	76.49600000000001
2008-01-01	74.99180000000000
2009-01-01	74.51130000000000
2010-01-01	75.88080000000000
2011-01-01	75.24590000000000
2012-01-01	77.48170000000000
2013-01-01	79.52700000000000
2014-01-01	82.20790000000000
2015-01-01	79.35770000000000
2016-01-01	75.25190000000000