Quarter	Billions of US Dollars
1971-01-01	12
1972-07-01	16
1977-01-01	98
1978-07-01	150
1979-04-01	64
1980-04-01	25
1980-07-01	18
1981-04-01	30
1981-10-01	15
1982-01-01	101
1982-07-01	-20
1983-07-01	-70
1983-10-01	78
1984-01-01	-114
1984-04-01	36
1984-07-01	10
1984-10-01	34
1985-04-01	38
1985-10-01	19
1986-01-01	-2
1986-07-01	-26
1987-01-01	107
1987-04-01	-32
1988-01-01	-59
1988-04-01	-8
1988-07-01	40
1988-10-01	-41
1989-01-01	78
1989-04-01	27
1989-07-01	126
1990-10-01	10
1991-04-01	14
1991-07-01	14
1991-10-01	29
1992-01-01	448
1992-04-01	14
1992-10-01	129
1993-01-01	-35
1993-04-01	59
1993-07-01	293
1993-10-01	-12
1994-01-01	-94
1994-04-01	22
1994-10-01	31
1995-04-01	-3
1995-07-01	156
1995-10-01	-15
1996-04-01	1051
1996-07-01	105
1996-10-01	-10
1997-01-01	-348
1997-07-01	-377
1997-10-01	94
1998-01-01	-40
1998-04-01	66
1998-07-01	20
1998-10-01	-178
1999-01-01	303
1999-04-01	-68
1999-07-01	100
1999-10-01	-6
2000-01-01	82
2000-04-01	-57
2000-07-01	118
2000-10-01	-97
2001-01-01	2432
2001-04-01	5560
2001-07-01	-264
2001-10-01	53
2002-01-01	-3
2002-04-01	446
2002-07-01	121
2002-10-01	-346
2003-01-01	77
2003-04-01	-78
2003-07-01	511
2003-10-01	902
2004-01-01	75
2004-04-01	-1219
2004-07-01	88
2004-10-01	1381
2005-01-01	237
2005-04-01	-497
2005-07-01	1301
2005-10-01	933
2006-01-01	-2244
2006-04-01	-4200
2006-07-01	411
2006-10-01	854
2007-01-01	957
2007-04-01	360
2007-07-01	-277
2007-10-01	126
2008-01-01	-150
2008-04-01	4502
2008-07-01	559
2008-10-01	-816
2009-01-01	1399
2009-04-01	7988
2009-07-01	2593
2009-10-01	-543
2010-01-01	2398
2010-04-01	465
2010-07-01	2917
2010-10-01	2382
2011-01-01	5175
2011-04-01	-169
2011-07-01	-655
2011-10-01	140
2012-01-01	6637
2012-04-01	920
2012-07-01	3599
2012-10-01	7201
2013-01-01	6300
2013-04-01	4254
2013-07-01	1329
2013-10-01	3883
2014-01-01	-1542
2014-04-01	916
2014-07-01	3435
2014-10-01	-1405
2015-01-01	5042
2015-04-01	3476
2015-07-01	-721
2015-10-01	891
2016-01-01	-1674
2016-04-01	-1650
2016-07-01	102
2016-10-01	2093
2017-01-01	3793
2017-04-01	-1653
2017-07-01	2086
2017-10-01	-2237
2018-01-01	3449
2018-04-01	-1144