Year	Percent
1995-01-01	25
1996-01-01	24
1997-01-01	24
1998-01-01	24
1999-01-01	23
2000-01-01	23
2001-01-01	22
2002-01-01	22
2003-01-01	22
2004-01-01	22
2005-01-01	21
2006-01-01	23
2007-01-01	23
2008-01-01	23
2009-01-01	23
2010-01-01	21
2011-01-01	20
2012-01-01	20
2013-01-01	20