Year	US Dollars, Sum Over Component Sub-periods
1981-01-01	374000000
1982-01-01	1853000000
1983-01-01	-633000000
1984-01-01	-977000000
1985-01-01	-126000000
1986-01-01	1003000000
1987-01-01	-1233000000
1988-01-01	167000000
1989-01-01	-495000000
1990-01-01	-2088000000
1991-01-01	-1210000000
1992-01-01	-1909000000
1993-01-01	-594000000
1994-01-01	-784000000
1995-01-01	-1573000000
1996-01-01	-4503000000
1997-01-01	5113000000
1998-01-01	-2345000000
1999-01-01	-3286000000
2000-01-01	-5051000000
2001-01-01	1371000000
2002-01-01	-4010000000
2003-01-01	-4236000000
2004-01-01	686000000
2005-01-01	657000000
2006-01-01	-6903000000
2007-01-01	-12706000000
2008-01-01	1945000000
2009-01-01	-12507000000
2010-01-01	-30286000000
2011-01-01	-11856000000
2012-01-01	-214000000
2013-01-01	7325000000