Year	US Dollars, Sum Over Component Sub-periods
1973-01-01	1474300000.0000000
1974-01-01	-3905000000.0000000
1975-01-01	2671400000.0000000
1976-01-01	-3422300000.0000000
1977-01-01	-431200000.0000000
1978-01-01	6998900000.0000000
1979-01-01	5186500000.0000000
1980-01-01	-4169100000.0000005
1981-01-01	-4723200000.0000000
1982-01-01	-12239700000.0000000
1983-01-01	-4801800000.0000000
1984-01-01	-1171600000.0000000
1985-01-01	-329300000.0000000
1986-01-01	1836200000.0000000
1987-01-01	-4437700000.0000000
1988-01-01	-4835100000.0000000
1989-01-01	-4675900000.0000000
1990-01-01	-9835800000.0000000
1991-01-01	-6120200000.0000000
1992-01-01	3868600000.0000000
1993-01-01	9251500000.0000000
1994-01-01	8058800000.0000000
1995-01-01	10918100000.0000000
1996-01-01	20521700000.0000000
1997-01-01	37767500000.0000000
1998-01-01	38500900000.0000000
1999-01-01	45832800000.0000000
2000-01-01	19263700000.0000000
2001-01-01	23517200000.0000000
2002-01-01	18128000000.0000000
2003-01-01	12971600000.0000000
2004-01-01	11134800000.0000000
2005-01-01	-10349000000.0000000
2006-01-01	-12984900000.0000000
2007-01-01	-25906100000.0000000
2008-01-01	-49306800000.0000000
2009-01-01	-34931900000.0000000
2010-01-01	-33715900000.0000000
2011-01-01	-48958600000.0000000
2012-01-01	-57098500000.0000000
2013-01-01	-36836700000.0000000