Year	US Dollars, Sum Over Component Sub-periods
1979-01-01	-2320000000
1980-01-01	-3039000000
1981-01-01	-2819000000
1982-01-01	-3491000000
1983-01-01	-2310000000
1984-01-01	-1658000000
1985-01-01	-1594000000
1986-01-01	-2557000000
1987-01-01	-2258000000
1988-01-01	-2896000000
1989-01-01	-2667000000
1990-01-01	-3596000000
1991-01-01	-3800000000
1992-01-01	-3184000000
1993-01-01	-5246000000
1994-01-01	-5657000000
1995-01-01	-7483000000
1996-01-01	-8681000000
1997-01-01	-10646000000
1998-01-01	-10111000000
1999-01-01	-6977000000
2000-01-01	-7162000000
2001-01-01	-7759000000
2002-01-01	-4957000000
2003-01-01	-4931000000
2004-01-01	-4678000000
2005-01-01	-8309000000
2006-01-01	-9640000000
2007-01-01	-13219000000
2008-01-01	-16690000000
2009-01-01	-19245000000
2010-01-01	-30835000000
2011-01-01	-37932000000
2012-01-01	-41042000000
2013-01-01	-47101000000
2014-01-01	-48928000000