Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	-800100000
1981-01-01	-1136400000
1982-01-01	3300500000
1983-01-01	-3118100000
1984-01-01	-3353200000
1985-01-01	2424100000
1986-01-01	-602800000
1987-01-01	-6100000000
1988-01-01	6733500000
1989-01-01	-396100000
1990-01-01	-3366600000
1991-01-01	-7694700000
1992-01-01	-1019900000
1993-01-01	-5941400000
1994-01-01	18392000000
1995-01-01	-10597800000
1996-01-01	-2483600000
1997-01-01	-9341300000
1998-01-01	-3012600000
1999-01-01	38400000
2000-01-01	-3756600000
2001-01-01	-9228400000
2002-01-01	-5845900000
2003-01-01	-8341100000
2004-01-01	-5166200000
2005-01-01	-9904300000
2006-01-01	-2206200000
2007-01-01	-10855800000
2008-01-01	-8078500000
2009-01-01	-4528400000
2010-01-01	-20615300000
2011-01-01	-28179900000
2012-01-01	-17524100000
2013-01-01	-17788800000
2014-01-01	-16328700000
2015-01-01	15666600000
2016-01-01	135700000