Year	Percent
1971-01-01	0.079080000000000000
1972-01-01	0.077471000000000000
1973-01-01	0.119410999999999990
1974-01-01	0.069467000000000000
1975-01-01	0.070451000000000000
1976-01-01	0.090987000000000000
1977-01-01	0.601277000000000100
1978-01-01	0.097544000000000000
1979-01-01	0.005203000000000000
1980-01-01	0.038589000000000000
1981-01-01	0.275908000000000000
1982-01-01	-0.050080000000000000
1983-01-01	-0.107478999999999990
1984-01-01	-0.014234000000000000
1985-01-01	-0.160457000000000000
1986-01-01	-0.170735000000000000
1987-01-01	-0.217448000000000000
1988-01-01	-0.216769000000000020
1989-01-01	0.013903000000000000
1990-01-01	0.103917000000000010
1991-01-01	0.146285000000000000
1992-01-01	0.507963000000000000
1993-01-01	0.271250000000000000
1994-01-01	-0.282751000000000030
1995-01-01	0.112568000000000000
1996-01-01	-0.014846000000000002
1997-01-01	-0.091145000000000000
1998-01-01	0.160754000000000000
1999-01-01	0.275084000000000000
2000-01-01	-0.214144999999999970
2001-01-01	-0.763485000000000100
2002-01-01	0.258105000000000030
2003-01-01	0.080752999999999990
2004-01-01	0.062055999999999990
2005-01-01	0.132049000000000000
2006-01-01	0.278468000000000000
2007-01-01	0.275235000000000000
2008-01-01	-0.253706000000000000
2009-01-01	0.938712999999999900
2010-01-01	-0.265810000000000000
2011-01-01	0.364415999999999960
2012-01-01	0.541885000000000100
2013-01-01	0.822120000000000100
2014-01-01	0.459389999999999970
2015-01-01	0.219480999999999980
2016-01-01	0.605680000000000000