Quarter	Billions of US Dollars
1972-07-01	0
1972-10-01	0
1973-01-01	0
1973-04-01	0
1973-07-01	0
1973-10-01	0
1974-01-01	0
1974-04-01	0
1974-07-01	0
1974-10-01	0
1975-01-01	0
1975-04-01	0
1975-07-01	0
1975-10-01	0
1976-01-01	0
1976-04-01	0
1976-07-01	0
1976-10-01	0
1977-01-01	0
1977-04-01	0
1977-07-01	0
1977-10-01	0
1978-01-01	0
1978-04-01	0
1978-07-01	0
1978-10-01	0
1979-01-01	30
1979-04-01	30
1979-07-01	52
1979-10-01	53
1980-01-01	19
1980-04-01	21
1980-07-01	0
1980-10-01	45
1981-01-01	42
1981-04-01	54
1981-07-01	77
1981-10-01	39
1982-01-01	36
1982-04-01	20
1982-07-01	115
1982-10-01	151
1983-01-01	284
1983-04-01	280
1983-07-01	159
1983-10-01	133
1984-01-01	0
1984-04-01	71
1984-07-01	90
1984-10-01	129
1985-01-01	130
1985-04-01	67
1985-07-01	109
1985-10-01	62
1986-01-01	76
1986-04-01	209
1986-07-01	158
1986-10-01	165
1987-01-01	214
1987-04-01	90
1987-07-01	148
1987-10-01	381
1988-01-01	334
1988-04-01	302
1988-07-01	302
1988-10-01	239
1989-01-01	195
1989-04-01	190
1989-07-01	122
1989-10-01	8
1990-01-01	19
1990-04-01	136
1990-07-01	138
1990-10-01	139
1991-01-01	125
1991-04-01	8
1991-07-01	0
1991-10-01	5
1992-01-01	35
1992-04-01	38
1992-07-01	167
1992-10-01	297
1993-01-01	266
1993-04-01	263
1993-07-01	200
1993-10-01	369
1994-01-01	380
1994-04-01	386
1994-07-01	347
1994-10-01	51
1995-01-01	534
1995-04-01	625
1995-07-01	922
1995-10-01	1087
1996-01-01	995
1996-04-01	1368
1996-07-01	973
1996-10-01	1565
1997-01-01	1604
1997-04-01	1726
1997-07-01	2003
1997-10-01	2175
1998-01-01	2007
1998-04-01	1861
1998-07-01	2980
1998-10-01	3362
1999-01-01	2759
1999-04-01	2806
1999-07-01	3398
1999-10-01	4204
2000-01-01	3059
2000-04-01	3347
2000-07-01	4296
2000-10-01	4515
2001-01-01	5047
2001-04-01	6775
2001-07-01	7511
2001-10-01	6106
2002-01-01	6019
2002-04-01	6809
2002-07-01	4463
2002-10-01	5391
2003-01-01	5282
2003-04-01	5302
2003-07-01	5181
2003-10-01	7731
2004-01-01	7519
2004-04-01	6982
2004-07-01	6887
2004-10-01	6898
2005-01-01	5692
2005-04-01	6048
2005-07-01	8142
2005-10-01	9821
2006-01-01	16385
2006-04-01	19946
2006-07-01	18415
2006-10-01	18444
2007-01-01	12679
2007-04-01	11129
2007-07-01	11770
2007-10-01	11599
2008-01-01	10669
2008-04-01	11965
2008-07-01	12331
2008-10-01	14025
2009-01-01	10037
2009-04-01	10163
2009-07-01	9639
2009-10-01	9928
2010-01-01	12489
2010-04-01	13859
2010-07-01	14840
2010-10-01	12950
2011-01-01	11755
2011-04-01	10482
2011-07-01	8525
2011-10-01	8431
2012-01-01	8934
2012-04-01	13234
2012-07-01	14261
2012-10-01	20545
2013-01-01	22667
2013-04-01	21907
2013-07-01	23777
2013-10-01	21904
2014-01-01	20674
2014-04-01	19138
2014-07-01	19036
2014-10-01	16124
2015-01-01	21145
2015-04-01	22301
2015-07-01	22064
2015-10-01	19479
2016-01-01	20375
2016-04-01	22236
2016-07-01	23934
2016-10-01	22449
2017-01-01	22325
2017-04-01	28880
2017-07-01	28688
2017-10-01	32048
2018-01-01	38792
2018-04-01	35935