Year	Percent
1995-01-01	12
1996-01-01	15
1997-01-01	15
1998-01-01	16
1999-01-01	17
2000-01-01	17
2001-01-01	16
2002-01-01	14
2003-01-01	12
2004-01-01	14
2005-01-01	14
2006-01-01	15
2007-01-01	15
2008-01-01	15
2009-01-01	13
2010-01-01	11
2011-01-01	11
2012-01-01	12
2013-01-01	12