Quarter	Billions of US Dollars
1987-01-01	1.3023
1987-04-01	1.2928
1987-07-01	1.2918
1987-10-01	1.8824
1988-01-01	2.3379
1988-04-01	2.2782
1988-07-01	2.4475
1988-10-01	2.8592
1989-01-01	3.0994
1989-04-01	3.0473
1989-07-01	3.4225
1989-10-01	3.6609
1990-01-01	3.8121
1990-04-01	3.9994
1990-07-01	4.4946
1990-10-01	5.0016
1991-01-01	4.6932
1991-04-01	4.6390
1991-07-01	5.0170
1991-10-01	6.5679
1992-01-01	6.6099
1992-04-01	7.0665
1992-07-01	7.6973
1992-10-01	6.8695
1993-01-01	8.3259
1993-04-01	9.3835
1993-07-01	11.2015
1993-10-01	11.2472
1994-01-01	12.7746
1994-04-01	13.4179
1994-07-01	14.1586
1994-10-01	14.6966
1995-01-01	15.7826
1995-04-01	16.8670
1995-07-01	16.2390
1995-10-01	16.5347
1996-01-01	16.1201
1996-04-01	16.4024
1996-07-01	15.7573
1996-10-01	15.2847
1997-01-01	14.6201
1997-04-01	15.4480
1997-07-01	16.3205
1997-10-01	17.1422
1998-01-01	16.6365
1998-04-01	16.4297
1998-07-01	17.5480
1998-10-01	19.4542
1999-01-01	18.0007
1999-04-01	17.1944
1999-07-01	17.5983
1999-10-01	18.2083
2000-01-01	17.3009
2000-04-01	16.2193
2000-07-01	14.7161
2000-10-01	14.6521
2001-01-01	14.6359
2001-04-01	14.2681
2001-07-01	14.7155
2001-10-01	14.5765
2002-01-01	13.9559
2002-04-01	15.0307
2002-07-01	14.5741
2002-10-01	14.6685
2003-01-01	14.7143
2003-04-01	15.1289
2003-07-01	15.5886
2003-10-01	16.9299
2004-01-01	15.7914
2004-04-01	17.3598
2004-07-01	19.0419
2004-10-01	21.0973
2005-01-01	22.8207
2005-04-01	26.1909
2005-07-01	29.6482
2005-10-01	32.0325
2006-01-01	34.3301
2006-04-01	37.7520
2006-07-01	40.9532
2006-10-01	48.3751
2007-01-01	53.5789
2007-04-01	61.9810
2007-07-01	65.7747
2007-10-01	72.4107
2008-01-01	73.5666
2008-04-01	75.9317
2008-07-01	73.2698
2008-10-01	69.1603
2009-01-01	68.5059
2009-04-01	69.6799
2009-07-01	72.5254
2009-10-01	74.3436
2010-01-01	73.6004
2010-04-01	72.1920
2010-07-01	72.8226
2010-10-01	77.1576
2011-01-01	77.9196
2011-04-01	79.0146
2011-07-01	77.0410
2011-10-01	75.5661
2012-01-01	76.9642
2012-04-01	75.0746
2012-07-01	81.5513
2012-10-01	86.1388
2013-01-01	88.4863
2013-04-01	95.0460
2013-07-01	97.9729
2013-10-01	97.5775
2014-01-01	94.9605
2014-04-01	92.3206
2014-07-01	86.7001
2014-10-01	85.1523
2015-01-01	80.6799
2015-04-01	83.5456