Year	Percent
1995-01-01	5
1996-01-01	9
1997-01-01	9
1998-01-01	13
1999-01-01	13
2000-01-01	13
2001-01-01	13
2002-01-01	10
2003-01-01	10
2004-01-01	9
2005-01-01	10
2006-01-01	10
2007-01-01	9
2008-01-01	14
2009-01-01	14
2010-01-01	14
2011-01-01	14
2012-01-01	14
2013-01-01	14