Year	US Dollars, Sum Over Component Sub-periods
1960-01-01	146000000
1961-01-01	50000000
1962-01-01	76000000
1963-01-01	142000000
1964-01-01	177000000
1965-01-01	93000000
1966-01-01	146000000
1967-01-01	120000000
1968-01-01	91000000
1969-01-01	50000000
1970-01-01	4000000
1971-01-01	29000000
1972-01-01	58000000
1973-01-01	68000000
1974-01-01	207000000
1975-01-01	-213000000
1976-01-01	-84000000
1977-01-01	29000000
1978-01-01	52000000
1979-01-01	-37000000
1980-01-01	-13000000
1981-01-01	-450000000
1982-01-01	-538000000
1983-01-01	-420000000
1984-01-01	-409000000
1985-01-01	-530000000
1986-01-01	-711000000
1987-01-01	-1266000000
1988-01-01	-1532000000
1989-01-01	-1735000000
1990-01-01	-1471000000
1991-01-01	-856000000
1992-01-01	-1800000000
1993-01-01	-1414000000
1994-01-01	-2162000000
1995-01-01	-3498000000
1996-01-01	-3922000000
1997-01-01	-3314000000
1998-01-01	-2818000000
1999-01-01	-2759000000
2000-01-01	-2514000000
2001-01-01	-2750000000
2002-01-01	-1569000000
2003-01-01	-1044000000
2004-01-01	2611000000
2005-01-01	5216000000
2006-01-01	10971000000
2007-01-01	16147000000
2008-01-01	19483000000
2009-01-01	12188000000
2010-01-01	6924000000