Year	Percent
1995-01-01	33
1996-01-01	39
1997-01-01	42
1998-01-01	48
1999-01-01	50
2000-01-01	59
2001-01-01	63
2002-01-01	63
2003-01-01	60
2004-01-01	57
2005-01-01	54
2006-01-01	54
2007-01-01	64
2008-01-01	67
2009-01-01	67
2010-01-01	67
2011-01-01	67
2012-01-01	69
2013-01-01	69