Quarter	Billions of US Dollars
1987-01-01	0.10000
1987-04-01	0.10000
1987-07-01	0.05000
1989-04-01	0.01500
1989-07-01	0.03500
1989-10-01	0.04400
1990-01-01	0.06000
1990-04-01	0.00500
1990-07-01	0.02000
1990-10-01	0.01900
1991-01-01	0.02000
1991-04-01	0.05000
1991-07-01	0.04000
1991-10-01	0.01600
1992-01-01	0.01800
1992-04-01	0.02700
1992-07-01	0.02800
1992-10-01	0.01400
1993-01-01	0.00900
1993-04-01	0.00600
1993-07-01	0.00600
1993-10-01	0.00400
1994-01-01	0.00850
1996-07-01	0.01071
1996-10-01	0.23861
1997-01-01	0.38223
1997-04-01	0.40840
1997-07-01	0.32793
1997-10-01	0.20904
1998-01-01	0.07054
1998-04-01	0.04732
1998-07-01	0.00549
1998-10-01	0.00027
1999-01-01	0.00372
1999-04-01	0.00306