Year	Percent
1995-01-01	14
1996-01-01	14
1997-01-01	13
1998-01-01	13.5
1999-01-01	15.5
2000-01-01	17
2001-01-01	21
2002-01-01	28
2003-01-01	28
2004-01-01	30.5
2005-01-01	31.5
2006-01-01	33
2007-01-01	33
2008-01-01	37.5
2009-01-01	38
2010-01-01	38
2011-01-01	37.5
2012-01-01	37
2013-01-01	35.5