Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	134000000
1981-01-01	24000000
1982-01-01	-15000000
1983-01-01	546000000
1984-01-01	836000000
1985-01-01	1737000000
1986-01-01	-333000000
1987-01-01	-297000000
1988-01-01	-607000000
1989-01-01	-2000000
1990-01-01	662000000
1991-01-01	2906000000
1992-01-01	5875000000
1993-01-01	11088000000
1994-01-01	8713000000
1995-01-01	14619000000
1996-01-01	21514000000
1997-01-01	13308000000
1998-01-01	775000000
1999-01-01	7908000000
2000-01-01	12697000000
2001-01-01	12227000000
2002-01-01	5378000000
2003-01-01	22690000000
2004-01-01	18375000000
2005-01-01	14114000000
2006-01-01	8056000000
2007-01-01	30378000000
2008-01-01	-25890000000
2009-01-01	48292000000
2010-01-01	43669000000
2011-01-01	17204000000
2012-01-01	33016000000
2013-01-01	20106000000