Year	US Dollars, Sum Over Component Sub-periods
1981-01-01	-566000000
1982-01-01	-5324000000
1983-01-01	-6338000000
1984-01-01	-1856000000
1985-01-01	-1923000000
1986-01-01	-3911000000
1987-01-01	-2098000000
1988-01-01	-1397000000
1989-01-01	-1108000000
1990-01-01	-2988000000
1991-01-01	-4260000000
1992-01-01	-2780000000
1993-01-01	-2106000000
1994-01-01	-2792000000
1995-01-01	-6431000000
1996-01-01	-7663000000
1997-01-01	-4889000000
1998-01-01	4097000000
1999-01-01	5783000000
2000-01-01	7992000000
2001-01-01	6901000000
2002-01-01	7824000000
2003-01-01	8107000000
2004-01-01	1563000000
2005-01-01	278000000
2006-01-01	10859000000
2007-01-01	10493000000
2008-01-01	125000000
2009-01-01	10629000000
2010-01-01	5146000000
2011-01-01	1685000000
2012-01-01	-24418000000
2013-01-01	-28450000000