Quarter	Billions of US Dollars
1997-10-01	0.016740
1998-01-01	0.016244
1998-04-01	0.016586
1998-07-01	0.017901
1998-10-01	0.017932
1999-01-01	0.016477
1999-04-01	0.015842
1999-07-01	0.016359