Year	Percent
1995-01-01	63
1996-01-01	63
1997-01-01	63
1998-01-01	56
1999-01-01	56
2000-01-01	56
2001-01-01	50
2002-01-01	50
2003-01-01	56
2004-01-01	64
2005-01-01	58
2006-01-01	58
2007-01-01	57
2008-01-01	60
2009-01-01	60
2010-01-01	67
2011-01-01	67
2012-01-01	71
2013-01-01	71