Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	412000000
1981-01-01	61000000
1982-01-01	57000000
1983-01-01	-48000000
1984-01-01	12000000
1985-01-01	748000000
1986-01-01	381000000
1987-01-01	408000000
1988-01-01	297000000
1989-01-01	72000000
1990-01-01	-353000000
1991-01-01	-507000000
1992-01-01	267000000
1993-01-01	-431000000
1994-01-01	-1011000000
1995-01-01	-325000000
1996-01-01	-513000000
1997-01-01	239000000
1998-01-01	868000000
1999-01-01	2272000000
2000-01-01	3926000000
2001-01-01	799000000
2002-01-01	917000000
2003-01-01	1963000000
2004-01-01	2691000000
2005-01-01	3243000000
2006-01-01	3964000000
2007-01-01	3686000000
2008-01-01	5169000000
2009-01-01	5094000000
2010-01-01	6699000000
2011-01-01	6845000000
2012-01-01	10164000000
2013-01-01	13493000000
2014-01-01	12422000000