Year	Percent
1980-01-01	4.5000000000000000
1981-01-01	1.1250000000000000
1982-01-01	0.2500000000000000
1983-01-01	0.2500000000000000
1984-01-01	0.2500000000000000
1985-01-01	0.2500000000000000
1986-01-01	0.2500000000000000
1987-01-01	0.2500000000000000
1988-01-01	0.2500000000000000
1989-01-01	0.2500000000000000
1990-01-01	0.2500000000000000
1991-01-01	5.5575000000000000
1992-01-01	5.9400000000000000
1993-01-01	6.4308300000000000
1994-01-01	5.0291700000000000
1995-01-01	5.9125000000000000
1996-01-01	5.8983300000000005
1997-01-01	3.4433300000000004
1998-01-01	5.4616700000000000
1999-01-01	5.6075000000000000
2000-01-01	6.9900000000000000
2001-01-01	3.4700000000000000
2002-01-01	3.9466699999999997
2003-01-01	4.3425000000000000
2004-01-01	4.3933300000000010
2005-01-01	5.1275000000000000
2006-01-01	6.0483300000000000
2007-01-01	7.9966700000000000
2008-01-01	8.0025000000000000
2009-01-01	5.0608300000000000
2010-01-01	3.3183300000000004
2011-01-01	2.9784200000000003
2012-01-01	4.6160600000000000
2013-01-01	2.2225000000000000
2014-01-01	0.3400000000000000
2015-01-01	0.9708330000000000
2016-01-01	3.3983300000000000