Year	Percent
1972-01-01	1.09538000000000000
1973-01-01	1.19830000000000000
1974-01-01	1.15249000000000000
1975-01-01	1.21116000000000000
1976-01-01	0.93572900000000000
1977-01-01	0.92851299999999990
1978-01-01	0.83556500000000000
1979-01-01	1.00802000000000010
1980-01-01	1.10649000000000000
1981-01-01	1.07446000000000000
1982-01-01	1.21000000000000000
1983-01-01	1.22845000000000000
1984-01-01	1.25680000000000000
1985-01-01	1.02739000000000000
1986-01-01	0.99217400000000000
1987-01-01	0.94022099999999990
1988-01-01	1.08140000000000000
1989-01-01	1.32433000000000000
1990-01-01	1.67369000000000010
1991-01-01	1.52288999999999990
1992-01-01	1.44681000000000000
1993-01-01	1.78320000000000000
1994-01-01	2.09372000000000020
1995-01-01	2.58398000000000000
1996-01-01	2.90812000000000030
1997-01-01	1.52909000000000000
1998-01-01	0.46141899999999997
1999-01-01	0.43825900000000000
2000-01-01	0.40913900000000000
2001-01-01	0.40614100000000000
2002-01-01	0.34898700000000000
2003-01-01	0.32908000000000004
2004-01-01	0.31016300000000000
2005-01-01	0.30686900000000000
2006-01-01	0.29987300000000000
2007-01-01	0.27939400000000003
2008-01-01	0.31615000000000000
2009-01-01	0.27282399999999996
2010-01-01	0.25275800000000000
2011-01-01	0.27027800000000000
2012-01-01	0.26208899999999996
2013-01-01	0.24070999999999998
2014-01-01	0.23003600000000002
2015-01-01	0.23675500000000002
2016-01-01	0.22195600000000000
2017-01-01	0.22573600000000002