Year	Percent
1995-01-01	31
1996-01-01	31
1997-01-01	30
1998-01-01	31
1999-01-01	32
2000-01-01	37
2001-01-01	41
2002-01-01	41
2003-01-01	41
2004-01-01	38
2005-01-01	39
2006-01-01	39
2007-01-01	39
2008-01-01	40
2009-01-01	43
2010-01-01	43
2011-01-01	43
2012-01-01	43
2013-01-01	46