Year	Percent
1995-01-01	42
1996-01-01	45
1997-01-01	46
1998-01-01	47
1999-01-01	48
2000-01-01	48
2001-01-01	48
2002-01-01	49
2003-01-01	51
2004-01-01	53
2005-01-01	54
2006-01-01	54
2007-01-01	56
2008-01-01	57
2009-01-01	56
2010-01-01	58
2011-01-01	58
2012-01-01	58
2013-01-01	58