Year	Percent
1995-01-01	22
1996-01-01	24
1997-01-01	28
1998-01-01	31
1999-01-01	33
2000-01-01	34
2001-01-01	34
2002-01-01	34
2003-01-01	34
2004-01-01	35
2005-01-01	34
2006-01-01	35
2007-01-01	36
2008-01-01	38
2009-01-01	37
2010-01-01	38
2011-01-01	38
2012-01-01	39
2013-01-01	40