Year	Percent
1996-01-01	60.823800000000000
1997-01-01	58.088400000000000
1998-01-01	57.082000000000000
1999-01-01	52.333999999999996
2000-01-01	51.051400000000000
2001-01-01	58.101300000000000
2002-01-01	58.311200000000000
2003-01-01	69.368500000000000
2004-01-01	66.212200000000000
2005-01-01	74.972700000000000
2006-01-01	76.309700000000000
2007-01-01	72.336700000000000
2008-01-01	73.944900000000000
2009-01-01	73.458900000000000
2010-01-01	71.296800000000000
2011-01-01	63.066400000000000
2012-01-01	61.597600000000000
2013-01-01	62.964200000000000
2014-01-01	64.572100000000000
2015-01-01	74.288800000000000
2016-01-01	74.045200000000000