Year	Dollars
1975-01-01	-40000000.00
1976-01-01	-34000000.00
1977-01-01	-63000000.00
1978-01-01	-40000000.00
1979-01-01	38000000.00
1980-01-01	25000000.00
1981-01-01	13000000.00
1982-01-01	5000000.00
1983-01-01	-3000000.00
1984-01-01	9000000.00
1985-01-01	7000000.00
1986-01-01	7000000.00
1987-01-01	5000000.00
1988-01-01	3000000.00
1989-01-01	23000000.00
1990-01-01	35000000.00
1991-01-01	42000000.00
1992-01-01	54000000.00
1993-01-01	81000000.00
1994-01-01	173000000.00
1995-01-01	352000000.00
1996-01-01	494000000.00
1997-01-01	482000000.00
1998-01-01	375000000.00
1999-01-01	339000000.00
2000-01-01	272503000.00
2001-01-01	-35971000.00
2002-01-01	432959000.00
2003-01-01	498188000.00
2004-01-01	339474000.00
2005-01-01	662761000.00
2006-01-01	869099000.00
2007-01-01	755863000.00
2008-01-01	1055117000.00
2009-01-01	1128528500.00
2010-01-01	1118545234.28
2011-01-01	1573178987.90