Year	Percent
1995-01-01	20
1996-01-01	22
1997-01-01	26
1998-01-01	29
1999-01-01	27
2000-01-01	28
2001-01-01	28
2002-01-01	28
2003-01-01	24
2004-01-01	22
2005-01-01	23
2006-01-01	28
2007-01-01	29
2008-01-01	33
2009-01-01	33
2010-01-01	35
2011-01-01	35
2012-01-01	40
2013-01-01	42