Quarter	Billions of US Dollars
1972-07-01	16
1972-10-01	16
1973-01-01	48
1973-04-01	73
1973-07-01	91
1973-10-01	84
1974-01-01	87
1974-04-01	88
1974-07-01	86
1974-10-01	91
1975-01-01	94
1975-04-01	93
1975-07-01	86
1975-10-01	87
1976-01-01	87
1976-04-01	86
1976-07-01	90
1976-10-01	150
1977-01-01	294
1977-04-01	481
1977-07-01	492
1977-10-01	539
1978-01-01	563
1978-04-01	560
1978-07-01	783
1978-10-01	773
1979-01-01	749
1979-04-01	757
1979-07-01	906
1979-10-01	893
1980-01-01	793
1980-04-01	922
1980-07-01	903
1980-10-01	866
1981-01-01	831
1981-04-01	779
1981-07-01	798
1981-10-01	885
1982-01-01	946
1982-04-01	898
1982-07-01	882
1982-10-01	1000
1983-01-01	978
1983-04-01	975
1983-07-01	911
1983-10-01	951
1984-01-01	829
1984-04-01	911
1984-07-01	889
1984-10-01	907
1985-01-01	910
1985-04-01	904
1985-07-01	947
1985-10-01	1024
1986-01-01	1058
1986-04-01	1101
1986-07-01	1091
1986-10-01	1118
1987-01-01	1211
1987-04-01	1110
1987-07-01	1240
1987-10-01	1423
1988-01-01	1619
1988-04-01	1167
1988-07-01	1110
1988-10-01	1001
1989-01-01	801
1989-04-01	772
1989-07-01	865
1989-10-01	1215
1990-01-01	1237
1990-04-01	2123
1990-07-01	3699
1990-10-01	5041
1991-01-01	4651
1991-04-01	3595
1991-07-01	3856
1991-10-01	3268
1992-01-01	4019
1992-04-01	4594
1992-07-01	4410
1992-10-01	4057
1993-01-01	3979
1993-04-01	4414
1993-07-01	2123
1993-10-01	2072
1994-01-01	2115
1994-04-01	2372
1994-07-01	2530
1994-10-01	2758
1995-01-01	4332
1995-04-01	4520
1995-07-01	4929
1995-10-01	5347
1996-01-01	5359
1996-04-01	7129
1996-07-01	7838
1996-10-01	8248
1997-01-01	7854
1997-04-01	7869
1997-07-01	8214
1997-10-01	8955
1998-01-01	8819
1998-04-01	8614
1998-07-01	9842
1998-10-01	9978
1999-01-01	9167
1999-04-01	9092
1999-07-01	9758
1999-10-01	10434
2000-01-01	9338
2000-04-01	10520
2000-07-01	11558
2000-10-01	13827
2001-01-01	14950
2001-04-01	17042
2001-07-01	20482
2001-10-01	22663
2002-01-01	23973
2002-04-01	31082
2002-07-01	29444
2002-10-01	34098
2003-01-01	35556
2003-04-01	36751
2003-07-01	39406
2003-10-01	48677
2004-01-01	47882
2004-04-01	51073
2004-07-01	52334
2004-10-01	59621
2005-01-01	58866
2005-04-01	58478
2005-07-01	62328
2005-10-01	65275
2006-01-01	69903
2006-04-01	77341
2006-07-01	85538
2006-10-01	89895
2007-01-01	85383
2007-04-01	84553
2007-07-01	90755
2007-10-01	91888
2008-01-01	96438
2008-04-01	100206
2008-07-01	91633
2008-10-01	96697
2009-01-01	85373
2009-04-01	94188
2009-07-01	94623
2009-10-01	93717
2010-01-01	89832
2010-04-01	82462
2010-07-01	89890
2010-10-01	87823
2011-01-01	93510
2011-04-01	96456
2011-07-01	90080
2011-10-01	89536
2012-01-01	95260
2012-04-01	89444
2012-07-01	87468
2012-10-01	87145
2013-01-01	90813
2013-04-01	97262
2013-07-01	104002
2013-10-01	110259
2014-01-01	118442
2014-04-01	121346
2014-07-01	121292
2014-10-01	118387
2015-01-01	121136
2015-04-01	133747
2015-07-01	140440
2015-10-01	142033
2016-01-01	154477
2016-04-01	162386
2016-07-01	171006
2016-10-01	171711
2017-01-01	181590
2017-04-01	202014
2017-07-01	215220
2017-10-01	233285
2018-01-01	251260
2018-04-01	247324