Year	Percent
1995-01-01	9
1996-01-01	9
1997-01-01	9
1998-01-01	9
1999-01-01	8
2000-01-01	8
2001-01-01	8
2002-01-01	0
2003-01-01	8
2004-01-01	13
2005-01-01	13
2006-01-01	20
2007-01-01	27
2008-01-01	27
2009-01-01	27
2010-01-01	21
2011-01-01	21
2012-01-01	21
2013-01-01	21