Year	Percent
1995-01-01	10
1996-01-01	15
1997-01-01	16
1998-01-01	25
1999-01-01	25
2000-01-01	25
2001-01-01	24
2002-01-01	28
2003-01-01	22
2004-01-01	24
2005-01-01	26
2006-01-01	26
2007-01-01	23
2008-01-01	27
2009-01-01	24
2010-01-01	21
2011-01-01	22
2012-01-01	26
2013-01-01	27