Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	-1694000000
1981-01-01	-347000000
1982-01-01	-502000000
1983-01-01	-464000000
1984-01-01	250000000
1985-01-01	449000000
1986-01-01	-923000000
1987-01-01	881000000
1988-01-01	-269000000
1989-01-01	-783000000
1990-01-01	-632000000
1991-01-01	-545000000
1992-01-01	-1143000000
1993-01-01	1003000000
1994-01-01	-1063000000
1995-01-01	-611000000
1996-01-01	955000000
1997-01-01	1462000000
1998-01-01	-1741000000
1999-01-01	-3689000000
2000-01-01	-3634000000
2001-01-01	-2527000000
2002-01-01	-1480000000
2003-01-01	-2024000000
2004-01-01	-6584000000
2005-01-01	-5314000000
2006-01-01	-16853000000
2007-01-01	-7673000000
2008-01-01	11332000000
2009-01-01	4655000000
2010-01-01	243000000
2011-01-01	-678000000
2012-01-01	2490000000
2013-01-01	-4361000000
2014-01-01	-3610000000