Year	Dollars
1976-01-01	-2793000000
1977-01-01	-2392000000
1978-01-01	-2545000000
1979-01-01	-3365000000
1980-01-01	-3417000000
1981-01-01	-3986000000
1982-01-01	-1941000000
1983-01-01	-1581000000
1984-01-01	-1083000000
1985-01-01	-982000000
1986-01-01	-1106000000
1987-01-01	-379000000
1988-01-01	-107000000
1989-01-01	-1409000000
1990-01-01	3067000000
1991-01-01	-2146000000
1992-01-01	-3104000000
1993-01-01	-5788000000
1994-01-01	634000000
1995-01-01	854000000
1996-01-01	-3264000000
1997-01-01	-5744000000
1998-01-01	-6901000000
1999-01-01	-12487000000
2000-01-01	-10343000000
2001-01-01	-5945000000
2002-01-01	-5544000000
2003-01-01	-5473000000
2004-01-01	-13259000000
2005-01-01	-7242000000
2006-01-01	-13156000000
2007-01-01	-26499000000
2008-01-01	-34957000000