Quarter	Billions of US Dollars
1987-01-01	0.1470
1987-04-01	0.1440
1987-07-01	0.1480
1987-10-01	0.1110
1988-01-01	0.2000
1988-04-01	0.2120
1988-07-01	0.1270
1988-10-01	0.1910
1989-01-01	0.2220
1989-04-01	0.1670
1989-07-01	0.1740
1989-10-01	0.1880
1990-01-01	0.1870
1990-04-01	0.1010
1990-07-01	0.0250
1990-10-01	0.0040
1991-01-01	0.0050
1991-04-01	0.0690
1991-07-01	0.1100
1991-10-01	0.1390
1992-01-01	0.1340
1992-04-01	0.1290
1992-07-01	0.1490
1992-10-01	0.1550
1993-01-01	0.1380
1993-04-01	0.1380
1993-07-01	0.1549
1993-10-01	0.1674
1994-01-01	0.2260
1994-04-01	0.1915
1994-07-01	0.2500
1994-10-01	0.2540
1995-01-01	0.2518
1995-04-01	0.2598
1995-07-01	0.2516
1995-10-01	0.3496
1996-01-01	0.3575
1996-04-01	0.3475
1996-07-01	0.3554
1996-10-01	0.3555
1997-01-01	0.3464
1997-04-01	0.3439
1997-07-01	0.3124
1997-10-01	0.1697
1998-01-01	0.2235
1998-04-01	0.2700
1998-07-01	0.2570
1998-10-01	0.0825
1999-01-01	0.0799
1999-04-01	0.2850
1999-07-01	0.2941
1999-10-01	0.1949
2000-01-01	0.2417
2000-04-01	0.2165
2000-07-01	0.1933
2000-10-01	0.4664
2001-01-01	0.1678
2001-04-01	0.1123
2001-07-01	0.0141
2001-10-01	0.0138
2002-01-01	0.0224
2002-04-01	0.0249
2002-07-01	0.0383
2002-10-01	0.1850
2003-01-01	0.2419
2003-04-01	0.2858
2003-07-01	0.2338
2003-10-01	0.2148
2004-01-01	0.2381
2004-04-01	0.2513
2004-07-01	0.3163
2004-10-01	0.2222
2005-01-01	0.1797
2005-04-01	0.1019
2005-07-01	1.0309
2005-10-01	1.7477
2006-01-01	2.9483
2006-04-01	2.4578
2006-07-01	3.8657
2006-10-01	5.6702
2007-01-01	7.1112
2007-04-01	7.1674
2007-07-01	6.8415
2007-10-01	4.8695
2008-01-01	6.2775
2008-04-01	5.5766
2008-07-01	5.6339
2008-10-01	2.0758
2009-01-01	1.6685
2009-04-01	1.6357
2009-07-01	1.8889
2009-10-01	1.3139
2010-01-01	0.9053
2010-04-01	0.7118
2010-07-01	0.6952
2010-10-01	0.5305
2011-01-01	0.6446
2011-04-01	0.9275
2011-07-01	1.5794
2011-10-01	1.4329
2012-01-01	2.9099
2012-04-01	3.6333
2012-07-01	3.8507
2012-10-01	6.4140
2013-01-01	8.1225
2013-04-01	9.5289
2013-07-01	10.5759
2013-10-01	11.2076
2014-01-01	10.2891
2014-04-01	11.4880
2014-07-01	11.1452
2014-10-01	11.1319
2015-01-01	11.9130
2015-04-01	15.1369