Year	Percent
1989-01-01	4.50
1990-01-01	5.30
1991-01-01	4.00
1992-01-01	4.50
1993-01-01	6.50
1994-01-01	11.00
1995-01-01	19.00
1996-01-01	13.75
1997-01-01	15.62
1998-01-01	19.00
1999-01-01	12.67
2000-01-01	11.50
2001-01-01	13.25
2002-01-01	13.25
2003-01-01	12.75
2004-01-01	10.31
2005-01-01	8.25
2006-01-01	7.20
2007-01-01	28.50
2008-01-01	33.50
2009-01-01	33.50
2010-01-01	38.50
2011-01-01	41.85
2012-01-01	49.50
2013-01-01	49.25
2014-01-01	47.60
2015-01-01	45.00