Year	Percent
1995-01-01	14
1996-01-01	14
1997-01-01	7
1998-01-01	7
1999-01-01	8
2000-01-01	14
2001-01-01	13
2002-01-01	11
2003-01-01	16
2004-01-01	21
2005-01-01	21
2006-01-01	32
2007-01-01	28
2008-01-01	22
2009-01-01	22
2010-01-01	22
2011-01-01	25
2012-01-01	20
2013-01-01	0