Quarter	Billions of US Dollars
1987-01-01	0.006652253
1987-04-01	0.006551470
1987-07-01	0.006538084
1987-10-01	0.007490637
1988-01-01	0.007111111
1988-04-01	0.006512537
1988-07-01	0.006254398
1988-10-01	0.006601749
1989-01-01	0.006255376
1989-04-01	0.006027728
1989-07-01	0.006313630
1989-10-01	0.006910850
1990-01-01	0.007020007