Quarter	Billions of US Dollars
1988-04-01	0.07553
1988-07-01	0.07432
1988-10-01	0.07946
1989-01-01	0.07573
1989-04-01	0.06940
1989-07-01	0.07179
1989-10-01	0.06971
1990-01-01	0.06361
1990-04-01	0.06540
1990-07-01	0.07257
1990-10-01	0.07440
1991-01-01	0.07092
1991-04-01	0.07252
1991-07-01	0.07527
1991-10-01	0.35974
1992-01-01	0.35015
1992-04-01	0.35936
1992-07-01	0.36779
1992-10-01	0.36032
1993-01-01	0.37190
1993-04-01	0.38735
1993-07-01	0.39020
1993-10-01	0.37881
1994-01-01	0.39389
1994-04-01	0.40192
1994-07-01	0.40315
1994-10-01	0.20052
1995-01-01	0.22384
1995-04-01	0.23641
1995-07-01	0.20346
1995-10-01	0.19450
1996-01-01	0.18818
1996-04-01	0.18278
1996-07-01	0.18023
1996-10-01	0.17241
1997-01-01	0.16123
1997-04-01	0.17483
1997-07-01	0.16529
1997-10-01	0.07695
1998-01-01	0.07573