Year	Percent
1995-01-01	13
1996-01-01	17
1997-01-01	27
1998-01-01	29
1999-01-01	32
2000-01-01	29
2001-01-01	27
2002-01-01	32
2003-01-01	32
2004-01-01	41
2005-01-01	45
2006-01-01	50
2007-01-01	62
2008-01-01	64
2009-01-01	64
2010-01-01	59
2011-01-01	57
2012-01-01	57
2013-01-01	55