Year	Percent
1995-01-01	25
1996-01-01	20
1997-01-01	20
1998-01-01	20
1999-01-01	17
2000-01-01	17
2001-01-01	17
2002-01-01	14
2003-01-01	14
2004-01-01	14
2005-01-01	14
2006-01-01	14
2007-01-01	25
2008-01-01	38
2009-01-01	38
2010-01-01	29
2011-01-01	38
2012-01-01	38
2013-01-01	38