Year	Percent
1996-01-01	88.373900000000000
1997-01-01	67.554600000000000
1998-01-01	48.341100000000000
1999-01-01	47.338100000000000
2000-01-01	47.858400000000000
2001-01-01	49.016999999999996
2002-01-01	56.988600000000000
2003-01-01	52.848300000000000
2004-01-01	54.947100000000000
2005-01-01	56.874400000000000
2006-01-01	56.681100000000000
2007-01-01	55.255900000000000
2008-01-01	59.241500000000000
2009-01-01	57.305700000000000
2010-01-01	61.373900000000000
2011-01-01	53.328999999999990
2012-01-01	49.747200000000000
2013-01-01	56.129900000000000
2014-01-01	57.266500000000000