Year	Dollars
1976-01-01	-4957000000
1977-01-01	-366000000
1978-01-01	-165000000
1979-01-01	-8023000000
1980-01-01	-8238000000
1981-01-01	1441000000
1982-01-01	-1847000000
1983-01-01	-2474000000
1984-01-01	-2818000000
1985-01-01	544000000
1986-01-01	3127000000
1987-01-01	1711000000
1988-01-01	320000000
1989-01-01	3261000000
1990-01-01	295000000
1991-01-01	6033000000
1992-01-01	4703000000
1993-01-01	5563000000
1994-01-01	-346000000
1995-01-01	-774000000
1996-01-01	-5508000000
1997-01-01	-4822000000
1998-01-01	2270000000
1999-01-01	-5894000000
2000-01-01	-10189000000