Year	Percent
1990-01-01	7.92
1991-01-01	7.20
1992-01-01	7.20
1993-01-01	10.08
1994-01-01	10.08
1995-01-01	10.44
1996-01-01	9.00
1997-01-01	8.55
1998-01-01	4.59
1999-01-01	3.24
2000-01-01	3.24
2001-01-01	3.24
2002-01-01	2.70
2003-01-01	2.70
2004-01-01	3.33
2005-01-01	3.33
2006-01-01	3.33
2007-01-01	3.33
2008-01-01	2.79
2009-01-01	2.79
2010-01-01	3.25
2011-01-01	3.25
2012-01-01	3.25
2013-01-01	3.25
2014-01-01	3.25
2015-01-01	2.90
2016-01-01	2.90
2017-01-01	2.90