Year	US Dollars, Sum Over Component Sub-periods
1975-01-01	-2149690000
1976-01-01	-1139750000
1977-01-01	-125110000
1978-01-01	651050000
1979-01-01	-164800000
1980-01-01	-1452940000
1981-01-01	-416660000
1982-01-01	-885310000
1983-01-01	-1050450000
1984-01-01	40770000
1985-01-01	-737240000
1986-01-01	-674200000
1987-01-01	-1720120000
1988-01-01	-2702610000
1989-01-01	-5773610000
1990-01-01	-6980820000
1991-01-01	-6713100000
1992-01-01	-5085750000
1993-01-01	-1120390000
1994-01-01	1095130000
1995-01-01	5512620000
1996-01-01	5020980000
1997-01-01	6431520000
1998-01-01	6714070000
1999-01-01	6965970000
2000-01-01	9473660000
2001-01-01	10420520000
2002-01-01	11450310000
2003-01-01	7938430000
2004-01-01	11725670000
2005-01-01	6557200000
2006-01-01	8649130000
2007-01-01	10497310000
2008-01-01	7098390000
2009-01-01	4234950000
2010-01-01	3588350000
2011-01-01	-3936110000
2012-01-01	-3501240000
2013-01-01	-2693180000