Year	Percent
1996-01-01	67.456200000000000
1997-01-01	65.934700000000000
1998-01-01	63.604900000000000
1999-01-01	63.378000000000000
2000-01-01	63.795900000000000
2001-01-01	65.035100000000000
2002-01-01	65.009000000000000
2003-01-01	66.745800000000000
2004-01-01	66.583600000000000
2005-01-01	65.370700000000000
2006-01-01	64.259300000000000
2007-01-01	64.143400000000000
2008-01-01	63.423600000000000
2009-01-01	62.461000000000006
2010-01-01	61.025600000000000
2011-01-01	62.121100000000000
2012-01-01	63.117500000000000
2013-01-01	62.791700000000000
2014-01-01	62.539400000000000
2015-01-01	60.588200000000000
2016-01-01	55.458400000000000