Year	Percent
1995-01-01	11
1996-01-01	15
1997-01-01	14
1998-01-01	14
1999-01-01	14
2000-01-01	27
2001-01-01	29
2002-01-01	32
2003-01-01	36
2004-01-01	39
2005-01-01	45
2006-01-01	45
2007-01-01	52
2008-01-01	59
2009-01-01	64
2010-01-01	67
2011-01-01	67
2012-01-01	67
2013-01-01	65