Year	Percent
1995-01-01	12
1996-01-01	12
1997-01-01	12
1998-01-01	13
1999-01-01	14
2000-01-01	14
2001-01-01	19
2002-01-01	29
2003-01-01	29
2004-01-01	30
2005-01-01	33
2006-01-01	33
2007-01-01	33
2008-01-01	39
2009-01-01	39
2010-01-01	39
2011-01-01	39
2012-01-01	35
2013-01-01	35