Year	US Dollars, Sum Over Component Sub-periods
1960-01-01	121000000
1961-01-01	127000000
1962-01-01	178000000
1963-01-01	-120000000
1964-01-01	59000000
1965-01-01	23000000
1966-01-01	128000000
1967-01-01	14000000
1968-01-01	-116000000
1969-01-01	-379000000
1970-01-01	-130000000
1971-01-01	-20000000
1972-01-01	128000000
1973-01-01	116000000
1974-01-01	435000000
1975-01-01	-621000000
1976-01-01	-1883000000
1977-01-01	-2100000000
1978-01-01	-1785000000
1979-01-01	-839000000
1980-01-01	632000000
1981-01-01	1869000000
1982-01-01	49000000
1983-01-01	-811000000
1984-01-01	-1526000000
1985-01-01	515000000
1986-01-01	873000000
1987-01-01	800000000
1988-01-01	1166000000
1989-01-01	868000000
1990-01-01	2855000000
1991-01-01	-2306000000
1992-01-01	-1962000000
1993-01-01	-4665000000
1994-01-01	-9347000000
1995-01-01	2170000000
1996-01-01	-2697000000
1997-01-01	-4553000000
1998-01-01	-2654000000
1999-01-01	-5984000000
2000-01-01	-6114000000
2001-01-01	-8702000000
2002-01-01	-18822000000
2003-01-01	-25553000000
2004-01-01	-23452000000
2005-01-01	-14147000000
2006-01-01	-29134000000
2007-01-01	-87190000000
2008-01-01	-208000000
2009-01-01	-11548000000
2010-01-01	-13141000000