Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	-878000000
1981-01-01	-1360000000
1982-01-01	-2255000000
1983-01-01	-2370000000
1984-01-01	-1572000000
1985-01-01	990000000
1986-01-01	1302000000
1987-01-01	-1406000000
1988-01-01	-829000000
1989-01-01	214000000
1990-01-01	170000000
1991-01-01	-1265000000
1992-01-01	-860000000
1993-01-01	-2411000000
1994-01-01	-3404000000
1995-01-01	-4791000000
1996-01-01	-5148000000
1997-01-01	-3208000000
1998-01-01	-894000000
1999-01-01	-1704000000
2000-01-01	-1838000000
2001-01-01	-1910000000
2002-01-01	-1174000000
2003-01-01	764000000
2004-01-01	2330000000
2005-01-01	4302000000
2006-01-01	6891000000
2007-01-01	5552000000
2008-01-01	3192000000
2009-01-01	7964000000
2010-01-01	7852000000
2011-01-01	3922000000
2012-01-01	2105000000
2013-01-01	6894000000
2014-01-01	9026000000