Year	US Dollars, Sum Over Component Sub-periods
1984-01-01	970000000
1985-01-01	1850000000
1986-01-01	1583000000
1987-01-01	1312000000
1988-01-01	-2111000000
1989-01-01	-1909000000
1990-01-01	3093000000
1991-01-01	-1198000000
1992-01-01	2164000000
1993-01-01	8595000000
1994-01-01	-4463000000
1995-01-01	-93000000
1996-01-01	938000000
1997-01-01	3625000000
1998-01-01	-1287000000
1999-01-01	-377000000
2000-01-01	12581000000
2001-01-01	-1633000000
2002-01-01	1384000000
2003-01-01	3065000000
2004-01-01	13360000000
2005-01-01	19485000000
2006-01-01	32064000000
2007-01-01	37264000000
2008-01-01	37460000000
2009-01-01	9046000000
2010-01-01	44492000000
2011-01-01	65947000000
2012-01-01	47438000000
2013-01-01	62578000000