Year	Percent
1995-01-01	36
1996-01-01	35
1997-01-01	39
1998-01-01	38
1999-01-01	38
2000-01-01	40
2001-01-01	40
2002-01-01	40
2003-01-01	40
2004-01-01	40
2005-01-01	44
2006-01-01	44
2007-01-01	44
2008-01-01	44
2009-01-01	40
2010-01-01	42
2011-01-01	42
2012-01-01	39
2013-01-01	35