Year	Percent
1995-01-01	24
1996-01-01	25
1997-01-01	26
1998-01-01	26
1999-01-01	29
2000-01-01	30
2001-01-01	29
2002-01-01	32
2003-01-01	29
2004-01-01	30
2005-01-01	33
2006-01-01	35
2007-01-01	46
2008-01-01	48
2009-01-01	50
2010-01-01	47
2011-01-01	48
2012-01-01	48
2013-01-01	48