Year	US Dollars, Sum Over Component Sub-periods
1970-01-01	151110000
1971-01-01	18280000
1972-01-01	-1566180000
1973-01-01	-2276930000
1974-01-01	-2250260000
1975-01-01	-2810850000
1976-01-01	-2668280000
1977-01-01	-591600000
1978-01-01	1597870000
1979-01-01	2398160000
1980-01-01	1933550000
1981-01-01	-2873490000
1982-01-01	-4184040000
1983-01-01	-4091560000
1984-01-01	-6368610000
1985-01-01	-3523040000
1986-01-01	-1632990000
1987-01-01	-4447580000
1988-01-01	-3142330000
1989-01-01	-9164990000
1990-01-01	-5571430000
1991-01-01	-5552970000
1992-01-01	-13859940000
1993-01-01	-18491310000
1994-01-01	-11041650000
1995-01-01	-17791260000
1996-01-01	-1660000000
1997-01-01	-12690670000
1998-01-01	-12602960000
1999-01-01	-5587480000
2000-01-01	-6783450000
2001-01-01	-6413130000
2002-01-01	-4822230000
2003-01-01	-26562220000
2004-01-01	-46769500000
2005-01-01	-39423730000
2006-01-01	-69775940000
2007-01-01	-36482860000
2008-01-01	-36547430000
2009-01-01	-57995380000
2010-01-01	-46242240000
2011-01-01	-71434440000
2012-01-01	-73725890000
2013-01-01	-76163650000