Year	Percent
1995-01-01	11
1996-01-01	10
1997-01-01	10
1998-01-01	10
1999-01-01	10
2000-01-01	10
2001-01-01	10
2002-01-01	10
2003-01-01	10
2004-01-01	20
2005-01-01	30
2006-01-01	30
2007-01-01	30
2008-01-01	40
2009-01-01	40
2010-01-01	40
2011-01-01	40
2012-01-01	40
2013-01-01	40