Year	Percent
1990-01-01	18.83
1991-01-01	18.47
1992-01-01	13.50
1993-01-01	8.82
1994-01-01	12.44
1995-01-01	13.99
1996-01-01	12.80
1997-01-01	20.00
1998-01-01	38.44
1999-01-01	12.51
2000-01-01	14.53
2001-01-01	17.62
2002-01-01	12.93
2003-01-01	8.31
2004-01-01	7.43
2005-01-01	12.75
2006-01-01	9.75
2007-01-01	8.00
2008-01-01	9.25
2009-01-01	6.50
2010-01-01	6.50
2011-01-01	6.00
2012-01-01	5.75
2013-01-01	7.50
2014-01-01	7.75
2015-01-01	7.50
2016-01-01	4.75
2017-01-01	4.25