Year	Percent
1996-01-01	70.43050000000000
1997-01-01	70.89280000000000
1998-01-01	74.63730000000000
1999-01-01	74.07750000000000
2000-01-01	73.34840000000000
2001-01-01	79.08970000000000
2002-01-01	80.37590000000000
2003-01-01	80.17770000000000
2004-01-01	74.53240000000000
2005-01-01	69.83400000000000
2006-01-01	69.56970000000000
2007-01-01	69.41450000000000
2008-01-01	66.95950000000000
2009-01-01	67.92240000000000
2010-01-01	67.00620000000000
2011-01-01	66.76910000000000
2012-01-01	65.82640000000000
2013-01-01	66.87090000000000
2014-01-01	70.33800000000001
2015-01-01	74.13470000000000
2016-01-01	78.32680000000000