Year	US Dollars, Monthly Level
1993-01-01	-2730000000
1994-01-01	-2360000000
1995-01-01	-2160000000
1996-01-01	-50000000
1997-01-01	4640000000
1998-01-01	7400000000
1999-01-01	4830000000
2000-01-01	7340000000
2001-01-01	5330000000
2002-01-01	9630000000
2003-01-01	18960000000
2004-01-01	35400000000
2005-01-01	70210000000
2006-01-01	91680000000
2007-01-01	134190000000
2008-01-01	160070000000