Year	US Dollars, Sum Over Component Sub-periods
1960-01-01	-732000000
1961-01-01	-698000000
1962-01-01	-774000000
1963-01-01	-665000000
1964-01-01	-922000000
1965-01-01	-1341000000
1966-01-01	-1009000000
1967-01-01	-1112000000
1968-01-01	-713000000
1969-01-01	-273000000
1970-01-01	-479000000
1971-01-01	-715000000
1972-01-01	-347000000
1973-01-01	-680000000
1974-01-01	921000000
1975-01-01	-112000000
1976-01-01	1583000000
1977-01-01	2124000000
1978-01-01	688000000
1979-01-01	54000000
1980-01-01	-1789000000
1981-01-01	-2715000000
1982-01-01	-2526000000
1983-01-01	-1949000000
1984-01-01	-2343000000
1985-01-01	-4143000000
1986-01-01	-4549000000
1987-01-01	-5175000000
1988-01-01	-7240000000
1989-01-01	-6831000000
1990-01-01	-7113000000
1991-01-01	-3646000000
1992-01-01	-4484000000
1993-01-01	-1909000000
1994-01-01	-1676000000
1995-01-01	-5533000000
1996-01-01	-5937000000
1997-01-01	-3007000000
1998-01-01	-6820000000
1999-01-01	-3243000000
2000-01-01	-4508000000
2001-01-01	1399000000
2002-01-01	7057000000
2003-01-01	8689000000
2004-01-01	698000000
2005-01-01	-10367000000
2006-01-01	-9514000000
2007-01-01	-7530000000
2008-01-01	-32049000000
2009-01-01	-25523000000
2010-01-01	-51907000000