Year	Percent
1995-01-01	0
1996-01-01	25
1997-01-01	25
1998-01-01	25
1999-01-01	25
2000-01-01	25
2001-01-01	25
2002-01-01	25
2003-01-01	25
2004-01-01	25
2005-01-01	20
2006-01-01	17
2007-01-01	17
2008-01-01	17
2009-01-01	17
2010-01-01	0
2011-01-01	0
2012-01-01	0
2013-01-01	17