Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	539000000
1981-01-01	1731000000
1982-01-01	2289000000
1983-01-01	2348000000
1984-01-01	1943000000
1985-01-01	-22000000
1986-01-01	-934000000
1987-01-01	1029000000
1988-01-01	-207000000
1989-01-01	-1144000000
1990-01-01	-53000000
1991-01-01	1045000000
1992-01-01	781000000
1993-01-01	1368000000
1994-01-01	1152000000
1995-01-01	3669000000
1996-01-01	3457000000
1997-01-01	263000000
1998-01-01	1532000000
1999-01-01	5995000000
2000-01-01	4795000000
2001-01-01	-2281000000
2002-01-01	-1814000000
2003-01-01	-4427000000
2004-01-01	-3911000000
2005-01-01	-9857000000
2006-01-01	-10716000000
2007-01-01	-2864000000
2008-01-01	-1318000000
2009-01-01	-10919000000
2010-01-01	-11929000000
2011-01-01	-12410000000
2012-01-01	-7190000000
2013-01-01	-9932000000
2014-01-01	-15154000000