Year	Percent
1995-01-01	23
1996-01-01	18
1997-01-01	30
1998-01-01	38
1999-01-01	36
2000-01-01	34
2001-01-01	35
2002-01-01	35
2003-01-01	32
2004-01-01	32
2005-01-01	33
2006-01-01	37
2007-01-01	40
2008-01-01	42
2009-01-01	42
2010-01-01	36
2011-01-01	36
2012-01-01	36
2013-01-01	33