Year	Dollars
1970-01-01	-3769000000
1971-01-01	11277000000
1972-01-01	8422000000
1973-01-01	-3513000000
1974-01-01	4858000000
1975-01-01	-21742000000
1976-01-01	-11652000000
1977-01-01	18171000000
1978-01-01	3845000000
1979-01-01	-25039000000
1980-01-01	-16861000000
1981-01-01	-23416000000
1982-01-01	-22553000000
1983-01-01	27115000000
1984-01-01	83185000000
1985-01-01	108512000000
1986-01-01	116286000000
1987-01-01	158654000000
1988-01-01	142179000000
1989-01-01	72683000000
1990-01-01	60222000000
1991-01-01	38043000000
1992-01-01	90030000000
1993-01-01	80632000000
1994-01-01	118902000000
1995-01-01	92561800000
1996-01-01	127839600000
1997-01-01	219947900000
1998-01-01	73737000000
1999-01-01	229400000000
2000-01-01	477991000000
2001-01-01	405163000000
2002-01-01	504197000000
2003-01-01	531355800000
2004-01-01	529525700000
2005-01-01	686621500000
2006-01-01	806774200000
2007-01-01	617381100000
2008-01-01	735415300000