Year	Dollars
1976-01-01	7660000000
1977-01-01	2816000000
1978-01-01	104000000
1979-01-01	11968000000
1980-01-01	-2438000000
1981-01-01	-3446000000
1982-01-01	5733000000
1983-01-01	358000000
1984-01-01	-414000000
1985-01-01	-476000000
1986-01-01	-5155000000
1987-01-01	-2090000000
1988-01-01	-1869000000
1989-01-01	-191000000
1990-01-01	327000000
1991-01-01	-9448000000
1992-01-01	-6504000000
1993-01-01	-4215000000
1994-01-01	4956000000
1995-01-01	3358000000
1996-01-01	5232000000
1997-01-01	2213000000
1998-01-01	-2139000000
1999-01-01	6555000000
2000-01-01	12481000000