Quarter	Billions of US Dollars
1971-04-01	3.678
1971-07-01	3.938
1971-10-01	4.152
1972-01-01	4.271
1972-04-01	4.124
1972-07-01	4.350
1972-10-01	4.368
1973-01-01	5.009
1973-04-01	5.302
1973-07-01	5.381
1973-10-01	5.431
1974-01-01	5.919
1974-04-01	5.989
1974-07-01	6.150
1974-10-01	6.601
1975-01-01	7.006
1975-04-01	6.561
1975-07-01	6.492
1975-10-01	6.874
1976-01-01	6.574
1976-04-01	6.296
1976-07-01	6.174
1976-10-01	6.612
1977-01-01	6.795
1977-04-01	7.003
1977-07-01	7.397
1977-10-01	8.612
1978-01-01	8.592
1978-04-01	8.821
1978-07-01	10.159
1978-10-01	11.622
1979-01-01	12.023
1979-04-01	12.665
1979-07-01	13.478
1979-10-01	14.491
1980-01-01	13.489
1980-04-01	15.199
1980-07-01	15.879
1980-10-01	15.907
1981-01-01	15.042
1981-04-01	14.153
1981-07-01	15.415
1981-10-01	16.421
1982-01-01	15.590
1982-04-01	15.599
1982-07-01	16.144
1982-10-01	16.251
1983-01-01	15.418
1983-04-01	15.083
1983-07-01	14.728
1983-10-01	15.011
1984-01-01	16.131
1984-04-01	15.356
1984-07-01	14.444
1984-10-01	14.257
1985-01-01	15.087
1985-04-01	15.442
1985-07-01	16.809
1985-10-01	19.358
1986-01-01	20.265
1986-04-01	21.130
1986-07-01	21.558
1986-10-01	22.770
1987-01-01	24.232
1987-04-01	25.117
1987-07-01	25.746
1987-10-01	29.787
1988-01-01	29.022
1988-04-01	27.374
1988-07-01	26.662
1988-10-01	28.089
1989-01-01	25.751
1989-04-01	25.591
1989-07-01	27.504
1989-10-01	30.402
1990-01-01	31.459
1990-04-01	32.918
1990-07-01	37.836
1990-10-01	40.359
1991-01-01	37.016
1991-04-01	36.371
1991-07-01	40.547
1991-10-01	44.703
1992-01-01	41.533
1992-04-01	45.497
1992-07-01	49.106
1992-10-01	46.137
1993-01-01	44.815
1993-04-01	42.869
1993-07-01	42.820
1993-10-01	44.480
1994-01-01	44.822
1994-04-01	47.696
1994-07-01	49.334
1994-10-01	51.248
1995-01-01	55.107
1995-04-01	58.149
1995-07-01	58.516
1995-10-01	61.119
1996-01-01	60.917
1996-04-01	63.253
1996-07-01	64.878
1996-10-01	69.910
1997-01-01	67.645
1997-04-01	71.329
1997-07-01	72.654
1997-10-01	75.815
1998-01-01	78.732
1998-04-01	84.731
1998-07-01	94.914
1998-10-01	99.761
1999-01-01	98.770
1999-04-01	104.543
1999-07-01	115.090
1999-10-01	119.407
2000-01-01	122.749
2000-04-01	123.514
2000-07-01	119.346
2000-10-01	129.491
2001-01-01	127.557
2001-04-01	127.852
2001-07-01	139.920
2001-10-01	144.683
2002-01-01	147.151
2002-04-01	174.813
2002-07-01	178.072
2002-10-01	191.657
2003-01-01	193.781
2003-04-01	211.825
2003-07-01	224.071
2003-10-01	262.948
2004-01-01	258.549
2004-04-01	261.290
2004-07-01	289.248
2004-10-01	337.463
2005-01-01	326.643
2005-04-01	315.900
2005-07-01	340.826
2005-10-01	351.614
2006-01-01	397.375
2006-04-01	452.817
2006-07-01	473.335
2006-10-01	513.045
2007-01-01	541.795
2007-04-01	568.800
2007-07-01	618.160
2007-10-01	653.826
2008-01-01	747.074
2008-04-01	762.029
2008-07-01	723.465
2008-10-01	735.978
2009-01-01	711.840
2009-04-01	750.779
2009-07-01	781.576
2009-10-01	779.626
2010-01-01	740.523
2010-04-01	673.934
2010-07-01	724.158
2010-10-01	713.226
2011-01-01	767.075
2011-04-01	782.085
2011-07-01	745.279
2011-10-01	720.515
2012-01-01	745.612
2012-04-01	717.438
2012-07-01	738.144
2012-10-01	727.190
2013-01-01	688.475
2013-04-01	685.698
2013-07-01	703.469
2013-10-01	735.196
2014-01-01	737.351
2014-04-01	751.557
2014-07-01	701.256
2014-10-01	712.320
2015-01-01	915.120
2015-04-01	929.529
2015-07-01	920.931
2015-10-01	925.599
2016-01-01	964.384
2016-04-01	945.681
2016-07-01	899.929
2016-10-01	866.205
2017-01-01	851.742
2017-04-01	887.459
2017-07-01	909.088
2017-10-01	906.268
2018-01-01	898.800