Year	Percent
1995-01-01	0
1996-01-01	0
1997-01-01	0
1998-01-01	0
1999-01-01	17
2000-01-01	23
2001-01-01	17
2002-01-01	17
2003-01-01	21
2004-01-01	21
2005-01-01	31
2006-01-01	50
2007-01-01	58
2008-01-01	69
2009-01-01	69
2010-01-01	69
2011-01-01	69
2012-01-01	77
2013-01-01	77