Year	US Dollars, Sum Over Component Sub-periods
1984-01-01	2545000000
1985-01-01	1264000000
1986-01-01	1788000000
1987-01-01	2005000000
1988-01-01	-1494000000
1989-01-01	-1880000000
1990-01-01	3151000000
1991-01-01	-1240000000
1992-01-01	2896000000
1993-01-01	7655000000
1994-01-01	-8057000000
1995-01-01	4286000000
1996-01-01	3970000000
1997-01-01	6503000000
1998-01-01	6531000000
1999-01-01	4086000000
2000-01-01	13740000000
2001-01-01	-2066000000
2002-01-01	7968000000
2003-01-01	4411000000
2004-01-01	11139000000
2005-01-01	15481000000
2006-01-01	24981000000
2007-01-01	29499000000
2008-01-01	36321000000
2009-01-01	-9066000000
2010-01-01	26661000000
2011-01-01	17154000000
2012-01-01	19072000000
2013-01-01	36704000000