Year	US Dollars, Sum Over Component Sub-periods
1979-01-01	-711000000
1980-01-01	-589000000
1981-01-01	-1407000000
1982-01-01	-454000000
1983-01-01	-9000000
1984-01-01	-6000000
1985-01-01	779000000
1986-01-01	1281000000
1987-01-01	-442000000
1988-01-01	3352000000
1989-01-01	-736000000
1990-01-01	-2055000000
1991-01-01	-3250000000
1992-01-01	29000000
1993-01-01	-5404000000
1994-01-01	-13010000000
1995-01-01	-1819000000
1996-01-01	-10316000000
1997-01-01	-1987000000
1998-01-01	-11392000000
1999-01-01	-4397000000
2000-01-01	-2989000000
2001-01-01	-6585000000
2002-01-01	-3211000000
2003-01-01	-9752000000
2004-01-01	-2085000000
2005-01-01	-5035000000
2006-01-01	-8076000000
2007-01-01	-18552000000
2008-01-01	-5269000000
2009-01-01	-30376000000
2010-01-01	-42567000000
2011-01-01	-39005000000
2012-01-01	-24550000000
2013-01-01	-39873000000
2014-01-01	-47741000000