Year	Percent
1996-01-01	72.51140000000000
1997-01-01	80.99370000000000
1998-01-01	80.67399999999999
1999-01-01	74.84850000000000
2000-01-01	71.64310000000000
2001-01-01	81.85570000000000
2002-01-01	83.72820000000000
2003-01-01	81.39600000000000
2004-01-01	79.95680000000000
2005-01-01	81.88170000000000
2006-01-01	79.04470000000000
2007-01-01	76.74770000000000
2008-01-01	79.53440000000000
2009-01-01	77.74600000000001
2010-01-01	74.06910000000000
2011-01-01	72.03100000000000
2012-01-01	70.75180000000000
2013-01-01	72.52810000000000
2014-01-01	72.87730000000000
2015-01-01	69.71740000000000
2016-01-01	68.04920000000000