Year	Percent
1995-01-01	50
1996-01-01	50
1997-01-01	43
1998-01-01	43
1999-01-01	38
2000-01-01	56
2001-01-01	56
2002-01-01	56
2003-01-01	56
2004-01-01	56
2005-01-01	56
2006-01-01	60
2007-01-01	64
2008-01-01	73
2009-01-01	80
2010-01-01	82
2011-01-01	73
2012-01-01	73
2013-01-01	73