Year	Percent
1996-01-01	85.25820000000000
1997-01-01	78.95760000000000
1998-01-01	78.91480000000000
1999-01-01	78.77510000000000
2000-01-01	78.59810000000000
2001-01-01	79.05290000000000
2002-01-01	79.47920000000000
2003-01-01	79.45700000000000
2004-01-01	85.45000000000000
2005-01-01	82.51960000000000
2006-01-01	81.95460000000000
2007-01-01	81.70390000000000
2008-01-01	81.95940000000000
2009-01-01	82.58880000000000
2010-01-01	81.80330000000000
2011-01-01	84.14399999999999
2012-01-01	81.56170000000000
2013-01-01	82.19790000000000
2014-01-01	86.95700000000001
2015-01-01	84.90850000000000
2016-01-01	81.01350000000000