Year	US Dollars, Sum Over Component Sub-periods
1981-01-01	-1669000000
1982-01-01	-2151000000
1983-01-01	467000000
1984-01-01	-620000000
1985-01-01	651000000
1986-01-01	-1269000000
1987-01-01	-753000000
1988-01-01	-933000000
1989-01-01	-1315000000
1990-01-01	744000000
1991-01-01	91000000
1992-01-01	-1279000000
1993-01-01	-2932000000
1994-01-01	-263000000
1995-01-01	-2255000000
1996-01-01	1319000000
1997-01-01	-2645000000
1998-01-01	2099000000
1999-01-01	2077000000
2000-01-01	3829000000
2001-01-01	701000000
2002-01-01	-1763000000
2003-01-01	-3510000000
2004-01-01	-3093000000
2005-01-01	-136000000
2006-01-01	1074000000
2007-01-01	-1378000000
2008-01-01	-238000000
2009-01-01	-2975000000
2010-01-01	-1480000000
2011-01-01	-3395000000
2012-01-01	-263000000
2013-01-01	-1605000000