Year	Percent
1995-01-01	23
1996-01-01	23
1997-01-01	23
1998-01-01	24
1999-01-01	24
2000-01-01	25
2001-01-01	24
2002-01-01	24
2003-01-01	26
2004-01-01	26
2005-01-01	28
2006-01-01	28
2007-01-01	25
2008-01-01	31
2009-01-01	31
2010-01-01	29
2011-01-01	29
2012-01-01	29
2013-01-01	32