Year	Percent
1995-01-01	10
1996-01-01	10
1997-01-01	10
1998-01-01	10
1999-01-01	9
2000-01-01	9
2001-01-01	9
2002-01-01	9
2003-01-01	12
2004-01-01	12
2005-01-01	12
2006-01-01	14
2007-01-01	14
2008-01-01	14
2009-01-01	24
2010-01-01	24
2011-01-01	22
2012-01-01	23
2013-01-01	23