Quarter	Billions of US Dollars
1997-01-01	0.016000
1997-04-01	0.005418
1998-04-01	0.000839
1998-07-01	-0.000509
1999-04-01	-0.000969
2000-04-01	-0.004779
2001-07-01	-0.000300
2001-10-01	0.000300
2005-01-01	-0.016000
2009-01-01	0.000000