Year	Percent
1995-01-01	41
1996-01-01	41
1997-01-01	44
1998-01-01	44
1999-01-01	44
2000-01-01	40
2001-01-01	40
2002-01-01	40
2003-01-01	42
2004-01-01	42
2005-01-01	41
2006-01-01	41
2007-01-01	40
2008-01-01	40
2009-01-01	38
2010-01-01	39
2011-01-01	39
2012-01-01	37
2013-01-01	37