Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	835000000
1981-01-01	2133000000
1982-01-01	2552000000
1983-01-01	2606000000
1984-01-01	2203000000
1985-01-01	249000000
1986-01-01	-400000000
1987-01-01	1700000000
1988-01-01	397000000
1989-01-01	-786000000
1990-01-01	675000000
1991-01-01	1902000000
1992-01-01	1850000000
1993-01-01	2231000000
1994-01-01	1937000000
1995-01-01	4478000000
1996-01-01	4231000000
1997-01-01	991000000
1998-01-01	2109000000
1999-01-01	6564000000
2000-01-01	5261000000
2001-01-01	-1560000000
2002-01-01	-1606000000
2003-01-01	-3893000000
2004-01-01	-3244000000
2005-01-01	-9130000000
2006-01-01	-9929000000
2007-01-01	-2043000000
2008-01-01	-179000000
2009-01-01	-10013000000
2010-01-01	-10946000000
2011-01-01	-11176000000
2012-01-01	-6516000000
2013-01-01	-8306000000
2014-01-01	-12624000000