Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	43000000
1981-01-01	-775000000
1982-01-01	-296000000
1983-01-01	-237000000
1984-01-01	-631000000
1985-01-01	-1239000000
1986-01-01	-903000000
1987-01-01	-294000000
1988-01-01	432000000
1989-01-01	572000000
1990-01-01	-844000000
1991-01-01	-637000000
1992-01-01	-991000000
1993-01-01	180000000
1994-01-01	1468000000
1995-01-01	313000000
1996-01-01	916000000
1997-01-01	2218000000
1998-01-01	-1195000000
1999-01-01	-4859000000
2000-01-01	-3422000000
2001-01-01	3469000000
2002-01-01	2781000000
2003-01-01	3129000000
2004-01-01	916000000
2005-01-01	4828000000
2006-01-01	3039000000
2007-01-01	-3509000000
2008-01-01	-3012000000
2009-01-01	2049000000
2010-01-01	3093000000
2011-01-01	7254000000
2012-01-01	4412000000
2013-01-01	1413000000