Year	Percent
1995-01-01	63
1996-01-01	62
1997-01-01	61
1998-01-01	59
1999-01-01	59
2000-01-01	57
2001-01-01	56
2002-01-01	60
2003-01-01	60
2004-01-01	60
2005-01-01	61
2006-01-01	63
2007-01-01	64
2008-01-01	65
2009-01-01	69
2010-01-01	68
2011-01-01	69
2012-01-01	70
2013-01-01	69