Year	Percent
1996-01-01	76.19780000000000
1997-01-01	73.40470000000000
1998-01-01	84.44740000000000
1999-01-01	80.35980000000000
2000-01-01	86.08730000000000
2001-01-01	86.32680000000000
2002-01-01	87.59090000000000
2003-01-01	84.57490000000000
2004-01-01	84.19030000000000
2005-01-01	86.47990000000000
2006-01-01	84.96799999999999
2007-01-01	85.36730000000000
2008-01-01	85.63280000000000
2009-01-01	85.67510000000000
2010-01-01	86.61100000000000
2011-01-01	86.20210000000000
2012-01-01	85.46040000000000
2013-01-01	82.86660000000000
2014-01-01	83.21160000000000
2015-01-01	78.49370000000000
2016-01-01	77.24620000000000