Quarter	Billions of US Dollars
1987-01-01	0.5770
1987-04-01	1.0220
1987-07-01	1.5000
1987-10-01	1.2380
1988-01-01	1.6480
1988-04-01	1.6400
1988-07-01	1.8900
1988-10-01	2.0340
1989-01-01	2.3740
1989-04-01	2.4250
1989-07-01	2.7020
1989-10-01	2.8640
1990-01-01	2.7320
1990-04-01	2.4270
1990-07-01	2.8000
1990-10-01	2.5060
1991-01-01	2.5190
1991-04-01	2.2960
1991-07-01	2.2600
1991-10-01	1.9590
1992-01-01	3.1310
1992-04-01	2.6160
1992-07-01	2.6290
1992-10-01	3.0300
1993-01-01	3.0710
1993-04-01	1.9210
1993-07-01	3.5358
1993-10-01	2.0698
1994-01-01	1.5866
1994-04-01	1.2381
1994-07-01	1.3877
1994-10-01	1.0380
1995-01-01	2.6987
1995-04-01	2.8805
1995-07-01	1.7909
1995-10-01	1.8852
1996-01-01	0.9990
1996-04-01	1.2731
1996-07-01	1.7935
1996-10-01	1.7126
1997-01-01	1.7282
1997-04-01	1.0951
1997-07-01	0.8507
1997-10-01	1.0930
1998-01-01	1.2485
1998-04-01	0.9983
1998-07-01	2.5735
1998-10-01	1.5035
1999-01-01	1.9101
1999-04-01	2.0538
1999-07-01	3.0976
1999-10-01	2.6038
2000-01-01	1.6444
2000-04-01	1.6216
2000-07-01	1.8150
2000-10-01	2.3956
2001-01-01	3.6646
2001-04-01	3.0706
2001-07-01	3.6127
2001-10-01	3.5979
2002-01-01	3.1374
2002-04-01	2.4786
2002-07-01	2.1682
2002-10-01	2.9386
2003-01-01	4.2383
2003-04-01	4.7555
2003-07-01	4.0796
2003-10-01	5.8541
2004-01-01	7.4731
2004-04-01	6.6078
2004-07-01	5.3749
2004-10-01	6.4911
2005-01-01	6.8566
2005-04-01	5.2928
2005-07-01	5.3320
2005-10-01	6.3179
2006-01-01	5.8222
2006-04-01	6.4305
2006-07-01	5.7964
2006-10-01	7.2531
2007-01-01	7.8149
2007-04-01	7.7588
2007-07-01	6.6225
2007-10-01	4.4987
2008-01-01	6.6922
2008-04-01	6.6333
2008-07-01	8.8414
2008-10-01	18.8178
2009-01-01	18.9189
2009-04-01	17.3965
2009-07-01	18.9512
2009-10-01	14.4288
2010-01-01	12.6565
2010-04-01	14.5606
2010-07-01	7.5631
2010-10-01	9.0573
2011-01-01	7.0400
2011-04-01	6.3791
2011-07-01	6.3578
2011-10-01	6.3053
2012-01-01	6.8104
2012-04-01	6.5646
2012-07-01	7.0190
2012-10-01	7.0474
2013-01-01	6.5548
2013-04-01	6.7931
2013-07-01	7.1756
2013-10-01	5.9385
2014-01-01	4.9249
2014-04-01	5.4579
2014-07-01	6.0083
2014-10-01	5.7498
2015-01-01	4.5050
2015-04-01	5.5045