Year	Percent
1995-01-01	36
1996-01-01	36
1997-01-01	33
1998-01-01	33
1999-01-01	33
2000-01-01	38
2001-01-01	38
2002-01-01	44
2003-01-01	44
2004-01-01	44
2005-01-01	50
2006-01-01	50
2007-01-01	50
2008-01-01	50
2009-01-01	47
2010-01-01	47
2011-01-01	47
2012-01-01	47
2013-01-01	47