Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	7141000000
1981-01-01	5211000000
1982-01-01	5185000000
1983-01-01	2960000000
1984-01-01	1517000000
1985-01-01	2444000000
1986-01-01	-1945000000
1987-01-01	-10295000000
1988-01-01	-2775000000
1989-01-01	-1271000000
1990-01-01	4974000000
1991-01-01	6180000000
1992-01-01	3120000000
1993-01-01	-3499000000
1994-01-01	13231000000
1995-01-01	20945000000
1996-01-01	24521000000
1997-01-01	2852000000
1998-01-01	-10931000000
1999-01-01	-8544000000
2000-01-01	-3396000000
2001-01-01	-17485000000
2002-01-01	4390000000
2003-01-01	-1264000000
2004-01-01	920000000
2005-01-01	7061000000
2006-01-01	49367000000
2007-01-01	47023000000
2008-01-01	-9851000000
2009-01-01	351000000
2010-01-01	-5434000000
2011-01-01	18647000000
2012-01-01	-14735000000
2013-01-01	-5777000000