Year	Percent
1981-01-01	1.1750000000000000
1982-01-01	3.7916700000000000
1983-01-01	2.0000000000000000
1984-01-01	0.8333330000000000
1985-01-01	0.8333330000000000
1986-01-01	0.8333330000000000
1987-01-01	0.8333330000000000
1988-01-01	0.1250000000000000
1989-01-01	1.2500000000000000
1990-01-01	1.2500000000000000
1991-01-01	1.2500000000000000
1992-01-01	1.2500000000000000
1993-01-01	1.2500000000000000
1994-01-01	1.2500000000000000
1995-01-01	0.1666670000000000
1996-01-01	1.3400000000000000
1997-01-01	1.0716700000000001
1998-01-01	1.9916700000000000
1999-01-01	1.4483300000000000
2000-01-01	0.6066670000000000
2001-01-01	1.9158300000000000
2002-01-01	1.8208300000000000
2003-01-01	1.9858300000000000
2004-01-01	2.0300000000000000
2005-01-01	1.8716700000000002
2006-01-01	1.4841700000000000
2007-01-01	1.3775000000000000
2008-01-01	1.2975000000000000
2009-01-01	2.1666700000000000
2010-01-01	1.6550000000000000
2011-01-01	1.6050000000000000
2012-01-01	1.6950000000000000
2013-01-01	1.7525000000000000
2014-01-01	1.7275000000000000
2015-01-01	1.7241700000000000
2016-01-01	1.8100000000000000