Year	US Dollars, Sum Over Component Sub-periods
1979-01-01	7000000
1980-01-01	25000000
1981-01-01	13000000
1982-01-01	6000000
1983-01-01	-3000000
1984-01-01	9000000
1985-01-01	6000000
1986-01-01	7000000
1987-01-01	5000000
1988-01-01	2000000
1989-01-01	-3000000
1990-01-01	1000000
1991-01-01	0
1992-01-01	37000000
1993-01-01	83000000
1994-01-01	174000000
1995-01-01	352000000
1996-01-01	454000000
1997-01-01	393000000
1998-01-01	320000000
1999-01-01	338000000
2000-01-01	273000000
2001-01-01	-36000000
2002-01-01	433000000
2003-01-01	498000000
2004-01-01	372000000
2005-01-01	663000000
2006-01-01	869000000
2007-01-01	756000000
2008-01-01	1055000000
2009-01-01	1129000000
2010-01-01	1119000000
2011-01-01	1573000000
2012-01-01	-1877000000
2013-01-01	1193000000
2014-01-01	590000000