Year	Percent
1995-01-01	20
1996-01-01	17
1997-01-01	17
1998-01-01	29
1999-01-01	38
2000-01-01	38
2001-01-01	43
2002-01-01	38
2003-01-01	38
2004-01-01	38
2005-01-01	38
2006-01-01	44
2007-01-01	44
2008-01-01	56
2009-01-01	56
2010-01-01	67
2011-01-01	67
2012-01-01	67
2013-01-01	67