Year	Percent
1980-01-01	4.00000
1981-01-01	1.50000
1982-01-01	13.45830
1983-01-01	2.00000
1984-01-01	2.50000
1985-01-01	2.50000
1986-01-01	2.00000
1987-01-01	2.50000
1988-01-01	2.50000
1989-01-01	2.50000
1990-01-01	1.76042
1991-01-01	1.30000
1992-01-01	1.40000
1993-01-01	1.67000
1994-01-01	2.10000
1995-01-01	4.85000
1996-01-01	4.94000
1997-01-01	4.06750
1998-01-01	5.70833
1999-01-01	5.93750
2000-01-01	5.57000
2001-01-01	5.94000
2002-01-01	5.98000
2003-01-01	6.26000
2004-01-01	5.81250
2005-01-01	6.89330
2006-01-01	7.78570
2007-01-01	7.44140
2008-01-01	7.63000
2009-01-01	5.71440
2010-01-01	5.50560
2011-01-01	6.92100
2012-01-01	7.30125
2013-01-01	6.75205
2014-01-01	6.33500
2015-01-01	5.00000
2016-01-01	4.96830