Year	Percent
1995-01-01	0
1996-01-01	0
1997-01-01	0
1998-01-01	0
1999-01-01	0
2000-01-01	0
2001-01-01	1
2002-01-01	1
2003-01-01	1
2004-01-01	1
2005-01-01	1
2006-01-01	1
2007-01-01	2
2008-01-01	1
2009-01-01	1
2010-01-01	1
2011-01-01	1
2012-01-01	1
2013-01-01	2