Year	Percent
1996-01-01	72.865900000000000
1997-01-01	76.875800000000000
1998-01-01	75.007700000000000
1999-01-01	70.121200000000000
2000-01-01	67.377000000000000
2001-01-01	66.661600000000000
2002-01-01	63.709200000000000
2003-01-01	62.975400000000000
2004-01-01	63.488200000000000
2005-01-01	62.102000000000000
2006-01-01	69.247500000000000
2007-01-01	76.176400000000000
2008-01-01	74.883200000000000
2009-01-01	61.614300000000000
2010-01-01	60.175700000000000
2011-01-01	58.391999999999996
2012-01-01	57.364800000000000
2013-01-01	59.620800000000000
2014-01-01	58.372000000000000
2015-01-01	46.776900000000000
2016-01-01	44.826100000000000