Year	Percent
1995-01-01	27
1996-01-01	25
1997-01-01	25
1998-01-01	25
1999-01-01	25
2000-01-01	27
2001-01-01	33
2002-01-01	30
2003-01-01	30
2004-01-01	31
2005-01-01	32
2006-01-01	33
2007-01-01	34
2008-01-01	34
2009-01-01	35
2010-01-01	40
2011-01-01	40
2012-01-01	42
2013-01-01	42