Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	9244400000
1981-01-01	22358800000
1982-01-01	7172300000
1983-01-01	-1198500000
1984-01-01	522400000
1985-01-01	-1316700000
1986-01-01	1540800000
1987-01-01	-2475800000
1988-01-01	-3443600000
1989-01-01	-1495900000
1990-01-01	9427400000
1991-01-01	7875800000
1992-01-01	2887000000
1993-01-01	-302300000
1994-01-01	-3778100000
1995-01-01	20444900000
1996-01-01	-18054900000
1997-01-01	-4367900000
1998-01-01	6291800000
1999-01-01	-10506800000
2000-01-01	945900000
2001-01-01	-272700000
2002-01-01	-1463500000
2003-01-01	-68800000
2004-01-01	-6990600000
2005-01-01	9221100000
2006-01-01	-3686800000
2007-01-01	2157800000
2008-01-01	-12055300000
2009-01-01	23339700000
2010-01-01	5089900000
2011-01-01	-6305000000
2012-01-01	-16317300000
2013-01-01	-13873800000
2014-01-01	-5667900000
2015-01-01	-15175000000
2016-01-01	-22362300000