Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	-854000000
1981-01-01	-1011000000
1982-01-01	-1971000000
1983-01-01	-1464000000
1984-01-01	-1364000000
1985-01-01	-1151000000
1986-01-01	-715000000
1987-01-01	919000000
1988-01-01	-680000000
1989-01-01	666000000
1990-01-01	-1833000000
1991-01-01	778000000
1992-01-01	1165000000
1993-01-01	-662000000
1994-01-01	-1740000000
1995-01-01	-1224000000
1996-01-01	1065000000
1997-01-01	-5105000000
1998-01-01	-6906000000
1999-01-01	-4171000000
2000-01-01	-1420000000
2001-01-01	2658000000
2002-01-01	-532000000
2003-01-01	763000000
2004-01-01	3154000000
2005-01-01	923000000
2006-01-01	68000000
2007-01-01	2107000000
2008-01-01	-2444000000
2009-01-01	1861000000
2010-01-01	-1915000000
2011-01-01	710000000
2012-01-01	2748000000
2013-01-01	2147000000