Year	Percent
1996-01-01	54.44370000000000
1997-01-01	52.02000000000000
1998-01-01	52.64440000000000
1999-01-01	58.30730000000000
2000-01-01	62.65850000000000
2001-01-01	68.26120000000000
2002-01-01	69.24900000000000
2003-01-01	70.49580000000000
2004-01-01	65.18310000000000
2005-01-01	69.14050000000000
2006-01-01	69.18360000000000
2007-01-01	66.59510000000000
2008-01-01	65.85790000000000
2009-01-01	68.50000000000000
2010-01-01	72.56690000000000
2011-01-01	77.93290000000000
2012-01-01	70.71440000000000
2013-01-01	75.15190000000000
2014-01-01	66.59899999999999