Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	-757000000
1981-01-01	-518000000
1982-01-01	-1269000000
1983-01-01	-1514000000
1984-01-01	-2021000000
1985-01-01	-2119000000
1986-01-01	-2164000000
1987-01-01	-2255000000
1988-01-01	-2294000000
1989-01-01	-2033000000
1990-01-01	-1981000000
1991-01-01	-1644000000
1992-01-01	-2051000000
1993-01-01	-2049000000
1994-01-01	-2551000000
1995-01-01	-2701000000
1996-01-01	-3406000000
1997-01-01	-3944000000
1998-01-01	-3998000000
1999-01-01	-5141000000
2000-01-01	-8376000000
2001-01-01	-5597000000
2002-01-01	-4530000000
2003-01-01	-4689000000
2004-01-01	-4045000000
2005-01-01	-1378000000
2006-01-01	-727000000
2007-01-01	-221000000
2008-01-01	-4021000000
2009-01-01	-5089000000
2010-01-01	-5179000000
2011-01-01	-3559000000
2012-01-01	-6491000000
2013-01-01	-6338000000
2014-01-01	-4792000000