Year	Percent
1996-01-01	79.39250000000000
1997-01-01	78.77250000000000
1998-01-01	78.17890000000000
1999-01-01	76.61530000000000
2000-01-01	75.97800000000001
2001-01-01	75.25610000000000
2002-01-01	73.91420000000000
2003-01-01	72.69360000000000
2004-01-01	71.05540000000000
2005-01-01	70.38920000000000
2006-01-01	66.73410000000000
2007-01-01	69.71670000000000
2008-01-01	69.40290000000000
2009-01-01	80.14290000000000
2010-01-01	79.55040000000000
2011-01-01	80.42470000000000
2012-01-01	80.77440000000000
2013-01-01	79.68370000000000
2014-01-01	79.70590000000000
2015-01-01	76.76470000000000
2016-01-01	76.78699999999999