Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	-492000000
1981-01-01	-19000000
1982-01-01	-794000000
1983-01-01	-547000000
1984-01-01	296000000
1985-01-01	-1108000000
1986-01-01	-682000000
1987-01-01	-112000000
1988-01-01	-1463000000
1989-01-01	-963000000
1990-01-01	-2425000000
1991-01-01	-3006000000
1992-01-01	-3299000000
1993-01-01	-4592000000
1994-01-01	-7369000000
1995-01-01	-13991000000
1996-01-01	-13487000000
1997-01-01	-13568000000
1998-01-01	6693000000
1999-01-01	-2606000000
2000-01-01	-2400000000
2001-01-01	6791000000
2002-01-01	1410000000
2003-01-01	-5132000000
2004-01-01	-8138000000
2005-01-01	-2658000000
2006-01-01	-7945000000
2007-01-01	-14836000000
2008-01-01	-13742000000
2009-01-01	1688000000
2010-01-01	-15981000000
2011-01-01	-27116000000
2012-01-01	-14021000000
2013-01-01	-36025000000