Year	Percent
1995-01-01	19
1996-01-01	19
1997-01-01	18
1998-01-01	18
1999-01-01	18
2000-01-01	23
2001-01-01	27
2002-01-01	32
2003-01-01	31
2004-01-01	38
2005-01-01	38
2006-01-01	38
2007-01-01	56
2008-01-01	53
2009-01-01	53
2010-01-01	53
2011-01-01	53
2012-01-01	53
2013-01-01	53