Year	Percent
1995-01-01	0
1996-01-01	0
1997-01-01	0
1998-01-01	9
1999-01-01	18
2000-01-01	50
2001-01-01	56
2002-01-01	67
2003-01-01	67
2004-01-01	67
2005-01-01	70
2006-01-01	70
2007-01-01	70
2008-01-01	70
2009-01-01	70
2010-01-01	70
2011-01-01	67
2012-01-01	67
2013-01-01	75