Year	Percent
1995-01-01	11
1996-01-01	17
1997-01-01	20
1998-01-01	17
1999-01-01	21
2000-01-01	27
2001-01-01	43
2002-01-01	46
2003-01-01	44
2004-01-01	46
2005-01-01	54
2006-01-01	56
2007-01-01	63
2008-01-01	61
2009-01-01	61
2010-01-01	61
2011-01-01	61
2012-01-01	64
2013-01-01	64