Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	-5070600000
1981-01-01	-3927400000
1982-01-01	-2133500000
1983-01-01	-1427500000
1984-01-01	-385800000
1985-01-01	-1512500000
1986-01-01	4491900000
1987-01-01	10778900000
1988-01-01	14837800000
1989-01-01	5267200000
1990-01-01	-1390400000
1991-01-01	-7511100000
1992-01-01	-2239900000
1993-01-01	2972900000
1994-01-01	-3507700000
1995-01-01	-8012100000
1996-01-01	-22953100000
1997-01-01	-8182600000
1998-01-01	42644200000
1999-01-01	24478700000
2000-01-01	14802900000
2001-01-01	8428100000
2002-01-01	7541900000
2003-01-01	15584300000
2004-01-01	32312400000
2005-01-01	18606500000
2006-01-01	14083300000
2007-01-01	21769700000
2008-01-01	3197500000
2009-01-01	32790500000
2010-01-01	29393500000
2011-01-01	26068200000
2012-01-01	48082300000
2013-01-01	70706400000