Year	Percent
1995-01-01	77
1996-01-01	77
1997-01-01	77
1998-01-01	74
1999-01-01	74
2000-01-01	73
2001-01-01	76
2002-01-01	80
2003-01-01	78
2004-01-01	77
2005-01-01	77
2006-01-01	80
2007-01-01	80
2008-01-01	79
2009-01-01	79
2010-01-01	79
2011-01-01	76
2012-01-01	83
2013-01-01	78