Year	Percent
1995-01-01	0
1996-01-01	15
1997-01-01	15
1998-01-01	15
1999-01-01	21
2000-01-01	36
2001-01-01	38
2002-01-01	38
2003-01-01	44
2004-01-01	44
2005-01-01	47
2006-01-01	50
2007-01-01	64
2008-01-01	71
2009-01-01	71
2010-01-01	71
2011-01-01	69
2012-01-01	67
2013-01-01	67