Quarter	Billions of US Dollars
1987-01-01	1.7180
1987-04-01	1.8970
1987-07-01	2.6560
1987-10-01	2.3780
1988-01-01	2.5900
1988-04-01	2.9930
1988-07-01	2.9690
1988-10-01	2.0700
1989-01-01	2.1180
1989-04-01	2.0790
1989-07-01	1.9660
1989-10-01	1.2310
1990-01-01	1.4600
1990-04-01	1.2680
1990-07-01	1.1180
1990-10-01	0.5040
1991-01-01	0.6210
1991-04-01	0.7390
1991-07-01	0.7790
1991-10-01	0.3350
1992-01-01	0.4810
1992-04-01	0.4440
1992-07-01	0.3170
1992-10-01	0.0700
1993-01-01	0.2190
1993-04-01	0.2740
1993-07-01	0.3997
1993-10-01	0.0585
1994-01-01	0.2368
1994-04-01	0.3432
1994-07-01	0.3540
1994-10-01	0.0611
1995-01-01	0.4108
1995-04-01	0.3208
1995-07-01	0.4590
1995-10-01	0.1286
1996-01-01	0.8735
1996-04-01	0.8538
1996-07-01	0.7848
1996-10-01	0.3685
1997-01-01	1.7190
1997-04-01	2.1127
1997-07-01	1.7673
1997-10-01	0.7281
1998-01-01	1.6450
1998-04-01	2.1577
1998-07-01	2.6875
1998-10-01	1.5848
1999-01-01	2.2113
1999-04-01	2.0297
1999-07-01	2.0363
1999-10-01	0.8459
2000-01-01	2.4353
2000-04-01	2.8711
2000-07-01	5.0048
2000-10-01	4.0027
2001-01-01	3.6242
2001-04-01	3.5870
2001-07-01	2.2887
2001-10-01	1.2228
2002-01-01	1.6244
2002-04-01	1.8132
2002-07-01	1.8178
2002-10-01	1.9548
2003-01-01	2.0787
2003-04-01	2.9150
2003-07-01	1.5090
2003-10-01	2.1950
2004-01-01	1.8381
2004-04-01	1.5405
2004-07-01	1.4801
2004-10-01	3.9851
2005-01-01	2.7998
2005-04-01	3.2526
2005-07-01	2.9962
2005-10-01	2.7498
2006-01-01	3.8550
2006-04-01	4.3157
2006-07-01	4.3002
2006-10-01	3.5001
2007-01-01	5.7431
2007-04-01	5.4466
2007-07-01	7.0647
2007-10-01	11.0762
2008-01-01	17.2889
2008-04-01	13.6894
2008-07-01	11.9195
2008-10-01	14.2849
2009-01-01	13.1322
2009-04-01	10.6912
2009-07-01	10.3743
2009-10-01	7.2879
2010-01-01	11.4467
2010-04-01	8.1177
2010-07-01	8.9263
2010-10-01	4.8432
2011-01-01	8.9738
2011-04-01	8.4174
2011-07-01	7.7501
2011-10-01	14.1719
2012-01-01	17.6831
2012-04-01	17.5616
2012-07-01	20.0051
2012-10-01	12.2041
2013-01-01	6.0948
2013-04-01	5.6001
2013-07-01	5.6833
2013-10-01	8.5696
2014-01-01	9.0339
2014-04-01	5.6544
2014-07-01	5.6653
2014-10-01	4.2449
2015-01-01	3.0531
2015-04-01	3.9437