Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	-3255000000
1981-01-01	-3599000000
1982-01-01	-3237000000
1983-01-01	-3250000000
1984-01-01	-2579000000
1985-01-01	-2376000000
1986-01-01	-1841000000
1987-01-01	-3707000000
1988-01-01	-2890000000
1989-01-01	-1905000000
1990-01-01	-2564000000
1991-01-01	-4861000000
1992-01-01	-4769000000
1993-01-01	-5607000000
1994-01-01	-5486000000
1995-01-01	-7438000000
1996-01-01	-7365000000
1997-01-01	-5583000000
1998-01-01	-3840000000
1999-01-01	-5109000000
2000-01-01	-3857000000
2001-01-01	-3770000000
2002-01-01	-4346000000
2003-01-01	-2921000000
2004-01-01	-2591000000
2005-01-01	-3512000000
2006-01-01	-3854000000
2007-01-01	-5240000000
2008-01-01	-6411000000
2009-01-01	733000000
2010-01-01	-1903000000
2011-01-01	-8141000000
2012-01-01	-9741000000
2013-01-01	-9329000000
2014-01-01	-8734000000