Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	-776000000
1981-01-01	-1215000000
1982-01-01	-1014000000
1983-01-01	-1078000000
1984-01-01	-1522000000
1985-01-01	-2234000000
1986-01-01	-2406000000
1987-01-01	-1738000000
1988-01-01	-1382000000
1989-01-01	-614000000
1990-01-01	-141000000
1991-01-01	-210000000
1992-01-01	-423000000
1993-01-01	-450000000
1994-01-01	-550000000
1995-01-01	-1383000000
1996-01-01	-1879000000
1997-01-01	-2512000000
1998-01-01	-5618000000
1999-01-01	-5125000000
2000-01-01	-2383000000
2001-01-01	-1247000000
2002-01-01	399000000
2003-01-01	253000000
2004-01-01	1042000000
2005-01-01	-1817000000
2006-01-01	75000000
2007-01-01	135000000
2008-01-01	4435000000
2009-01-01	2277000000
2010-01-01	1016000000
2011-01-01	2891000000
2012-01-01	5718000000
2013-01-01	4803000000