Year	Percent
1996-01-01	54.141700000000000
1997-01-01	52.343700000000000
1998-01-01	46.153999999999996
1999-01-01	52.060500000000000
2000-01-01	45.945900000000000
2001-01-01	47.973200000000000
2002-01-01	50.956900000000000
2003-01-01	52.384100000000000
2004-01-01	52.730100000000000
2005-01-01	53.431300000000000
2006-01-01	51.817800000000000
2007-01-01	53.821500000000000
2008-01-01	56.732600000000000
2009-01-01	55.588300000000000
2010-01-01	55.721800000000000
2011-01-01	59.381900000000000
2012-01-01	67.885700000000000
2013-01-01	72.063500000000000
2014-01-01	74.290700000000000
2015-01-01	73.042400000000000
2016-01-01	72.233900000000000