Year	Dollars
1975-01-01	-575152666.96944237
1976-01-01	-478774179.23542404
1977-01-01	-388095841.46729088
1978-01-01	-3707856708.38916780
1979-01-01	-3890389201.80702590
1980-01-01	8494825654.98984150
1981-01-01	3506568323.90313720
1982-01-01	9271684792.75364300
1983-01-01	8412815935.17300420
1984-01-01	3159734679.57091710
1985-01-01	2440755276.81879330
1986-01-01	-2055380921.49602130
1987-01-01	994066100.11817932
1988-01-01	-1306889442.00811770
1989-01-01	10360874936.58082600
1990-01-01	24763645171.52507000
1991-01-01	-3065702799.46318340
1992-01-01	-8035086294.37548450
1993-01-01	-16674505814.94099800
1994-01-01	10180772767.05608400
1995-01-01	-7517191729.12180330
1996-01-01	-22642600511.25330000
1997-01-01	-37598763840.93765300
1998-01-01	-29288872928.73726700
1999-01-01	-42258836939.80740400
2000-01-01	-31964241680.94870000
2001-01-01	-33088456766.64350100
2002-01-01	-20294281785.92450000
2003-01-01	13525981354.80200000
2004-01-01	-6255575552.22992040
2005-01-01	-9478322255.40662000
2006-01-01	40610744954.77159900
2007-01-01	40360481447.69599900
2008-01-01	13791990783.43090100