Quarter	Billions of US Dollars
1972-07-01	16
1973-01-01	31
1973-04-01	20
1973-07-01	16
1976-10-01	58
1977-01-01	146
1977-04-01	180
1978-07-01	150
1979-07-01	105
1980-01-01	-13
1980-04-01	53
1980-07-01	-4
1980-10-01	11
1981-01-01	14
1981-10-01	41
1982-01-01	107
1982-04-01	-10
1982-07-01	1
1982-10-01	75
1983-04-01	10
1983-07-01	-54
1983-10-01	55
1984-01-01	-132
1984-04-01	111
1984-07-01	10
1984-10-01	34
1985-04-01	-11
1985-07-01	-20
1985-10-01	39
1986-04-01	6
1986-07-01	-59
1986-10-01	5
1987-01-01	-16
1987-04-01	-132
1987-07-01	-13
1987-10-01	-7
1988-01-01	-38
1988-04-01	-8
1988-07-01	-63
1988-10-01	-194
1989-01-01	-34
1989-07-01	-11
1989-10-01	210
1990-04-01	19
1990-07-01	9
1990-10-01	10
1991-01-01	-10
1991-04-01	-104
1991-07-01	60
1991-10-01	8
1992-01-01	159
1992-04-01	30
1992-07-01	46
1992-10-01	84
1993-01-01	76
1993-04-01	120
1993-07-01	119
1993-10-01	-10
1994-04-01	195
1994-07-01	109
1994-10-01	237
1995-01-01	1292
1995-04-01	181
1995-07-01	530
1995-10-01	441
1996-01-01	115
1996-04-01	1889
1996-07-01	736
1996-10-01	512
1997-01-01	-51
1997-04-01	66
1997-07-01	443
1997-10-01	865
1998-01-01	10
1998-04-01	-231
1998-07-01	898
1998-10-01	-76
1999-01-01	-411
1999-04-01	101
1999-07-01	336
1999-10-01	879
2000-01-01	-869
2000-04-01	1215
2000-07-01	1498
2000-10-01	2037
2001-01-01	1736
2001-04-01	2441
2001-07-01	2547
2001-10-01	2927
2002-01-01	1503
2002-04-01	4218
2002-07-01	-1368
2002-10-01	3165
2003-01-01	566
2003-04-01	-23
2003-07-01	1757
2003-10-01	6364
2004-01-01	141
2004-04-01	3537
2004-07-01	597
2004-10-01	2978
2005-01-01	1602
2005-04-01	2745
2005-07-01	4206
2005-10-01	4168
2006-01-01	3496
2006-04-01	4556
2006-07-01	8463
2006-10-01	1574
2007-01-01	-5173
2007-04-01	-1529
2007-07-01	2709
2007-10-01	-1305
2008-01-01	-894
2008-04-01	4289
2008-07-01	-1500
2008-10-01	7012
2009-01-01	-7594
2009-04-01	4036
2009-07-01	-2041
2009-10-01	208
2010-01-01	613
2010-04-01	-2121
2010-07-01	835
2010-10-01	-890
2011-01-01	2013
2011-04-01	1764
2011-07-01	-2250
2011-10-01	1885
2012-01-01	3895
2012-04-01	-2455
2012-07-01	-3691
2012-10-01	-1085
2013-01-01	5898
2013-04-01	5455
2013-07-01	4476
2013-10-01	5183
2014-01-01	8052
2014-04-01	3324
2014-07-01	6542
2014-10-01	410
2015-01-01	11080
2015-04-01	9558
2015-07-01	6942
2015-10-01	3973
2016-01-01	7922
2016-04-01	9935
2016-07-01	8055
2016-10-01	8755
2017-01-01	7622
2017-04-01	11930
2017-07-01	8404
2017-10-01	15510
2018-01-01	12567
2018-04-01	6609