Year	Percent
1995-01-01	25
1996-01-01	22
1997-01-01	22
1998-01-01	33
1999-01-01	33
2000-01-01	44
2001-01-01	40
2002-01-01	36
2003-01-01	36
2004-01-01	36
2005-01-01	42
2006-01-01	38
2007-01-01	46
2008-01-01	53
2009-01-01	59
2010-01-01	61
2011-01-01	61
2012-01-01	61
2013-01-01	61