Year	US Dollars, Sum Over Component Sub-periods
1971-01-01	-2489350000
1972-01-01	-3047400000
1973-01-01	-4740680000
1974-01-01	-4703080000
1975-01-01	-5450940000
1976-01-01	-5305690000
1977-01-01	-6469880000
1978-01-01	-7247480000
1979-01-01	-10990870000
1980-01-01	-12279550000
1981-01-01	-9989500000
1982-01-01	-8657550000
1983-01-01	-8173690000
1984-01-01	-6347700000
1985-01-01	-5544120000
1986-01-01	-8407900000
1987-01-01	-12535130000
1988-01-01	-16344520000
1989-01-01	-15382350000
1990-01-01	-22512180000
1991-01-01	-26055570000
1992-01-01	-36054040000
1993-01-01	-38340300000
1994-01-01	-46115820000
1995-01-01	-53440200000
1996-01-01	-51714500000
1997-01-01	-48148800000
1998-01-01	-51605610000
1999-01-01	-57915130000
2000-01-01	-55017600000
2001-01-01	-54142080000
2002-01-01	-43192030000
2003-01-01	-50721060000
2004-01-01	-51109290000
2005-01-01	-48827970000
2006-01-01	-38301790000
2007-01-01	-39411400000
2008-01-01	-37370010000
2009-01-01	-21962950000
2010-01-01	-18082430000
2011-01-01	-16349960000
2012-01-01	-17396380000
2013-01-01	-17426470000