Year	Percent
1995-01-01	55
1996-01-01	57
1997-01-01	53
1998-01-01	52
1999-01-01	57
2000-01-01	57
2001-01-01	57
2002-01-01	55
2003-01-01	52
2004-01-01	58
2005-01-01	63
2006-01-01	63
2007-01-01	62
2008-01-01	62
2009-01-01	63
2010-01-01	65
2011-01-01	67
2012-01-01	67
2013-01-01	67