Year	Percent
1995-01-01	22
1996-01-01	24
1997-01-01	29
1998-01-01	32
1999-01-01	37
2000-01-01	37
2001-01-01	37
2002-01-01	34
2003-01-01	35
2004-01-01	33
2005-01-01	32
2006-01-01	32
2007-01-01	32
2008-01-01	33
2009-01-01	33
2010-01-01	33
2011-01-01	33
2012-01-01	32
2013-01-01	32