Quarter	Billions of US Dollars
1971-10-01	0.0306
1972-01-01	0.0815
1972-04-01	0.0400
1972-07-01	0.0513
1972-10-01	0.1448
1973-01-01	0.0953
1973-04-01	0.0250
1973-07-01	0.0757
1973-10-01	0.1092
1974-01-01	0.0050
1974-07-01	0.0019
1974-10-01	0.0750
1975-01-01	0.1300
1975-04-01	0.1466
1975-07-01	0.0490
1975-10-01	0.0618
1976-01-01	0.0617
1976-04-01	0.1931
1976-07-01	0.1307
1976-10-01	0.2724
1977-01-01	0.3189
1977-04-01	0.6124
1977-07-01	0.8820
1977-10-01	1.0882
1978-01-01	1.1764
1978-04-01	0.6848
1978-07-01	0.3959
1978-10-01	0.6101
1979-01-01	0.5744
1979-04-01	0.2639
1979-07-01	0.4834
1979-10-01	0.3141
1980-01-01	0.1112
1980-04-01	0.5210
1980-07-01	0.2878
1980-10-01	0.2769
1981-01-01	0.3197
1981-04-01	0.9451
1981-07-01	0.5254
1981-10-01	0.7702
1982-01-01	0.7845
1982-04-01	0.2101
1982-07-01	0.2444
1982-10-01	0.0181
1983-04-01	0.0500
1984-04-01	0.0913
1984-10-01	0.0432
1985-01-01	0.1892
1985-04-01	0.0100
1985-07-01	0.0962
1985-10-01	0.0972
1986-01-01	0.2702
1986-04-01	0.0500
1986-07-01	0.0752
1987-01-01	0.0489
1987-04-01	0.0500
1987-10-01	0.0562
1988-01-01	0.1778
1988-07-01	0.1000
1988-10-01	0.5575
1989-01-01	0.2627
1989-04-01	0.1000
1989-07-01	1.0000
1989-10-01	0.1500
1990-01-01	36.0136
1990-04-01	0.9986
1990-07-01	0.7078
1990-10-01	16.4755
1991-01-01	2.5644
1991-04-01	1.3150
1991-07-01	2.0209
1991-10-01	1.8152
1992-01-01	1.7580
1992-04-01	20.0050
1992-07-01	1.5850
1992-10-01	2.2933
1993-01-01	3.1881
1993-04-01	4.6140
1993-07-01	5.3453
1993-10-01	15.8375
1994-01-01	6.8643
1994-04-01	45.0566
1994-07-01	2.8351
1994-10-01	5.2958
1995-01-01	6.4082
1995-04-01	6.0610
1995-07-01	5.5404
1995-10-01	6.2316
1996-01-01	10.3673
1996-04-01	19.2791
1996-07-01	20.8076
1996-10-01	10.5998
1997-01-01	17.7747
1997-04-01	19.1315
1997-07-01	19.6743
1997-10-01	5.3085
1998-01-01	13.8464
1998-04-01	14.0452
1998-07-01	7.5189
1998-10-01	6.0856
1999-01-01	9.8537
1999-04-01	13.1132
1999-07-01	7.2272
1999-10-01	12.1281
2000-01-01	18.4576
2000-04-01	9.6013
2000-07-01	21.3480
2000-10-01	2.3634
2001-01-01	18.7625
2001-04-01	40.7538
2001-07-01	8.9132
2001-10-01	8.6990
2002-01-01	12.2043
2002-04-01	6.0022
2002-07-01	5.9383
2002-10-01	5.7652
2003-01-01	9.7916
2003-04-01	14.4248
2003-07-01	11.4379
2003-10-01	12.9145
2004-01-01	11.7649
2004-04-01	8.6190
2004-07-01	12.8600
2004-10-01	7.2333
2005-01-01	29.9663
2005-04-01	9.9468
2005-07-01	15.0550
2005-10-01	12.0910
2006-01-01	13.2956
2006-04-01	3.9872
2006-07-01	10.1540
2006-10-01	15.8265
2007-01-01	22.8955
2007-04-01	14.4187
2007-07-01	7.9326
2007-10-01	8.7956
2008-01-01	6.6642
2008-04-01	12.5897
2008-07-01	2.5421
2008-10-01	2.2484
2009-01-01	9.8083
2009-04-01	6.9946
2009-07-01	21.0784
2009-10-01	34.3855
2010-01-01	23.7213
2010-04-01	23.3399
2010-07-01	36.0524
2010-10-01	18.3650
2011-01-01	30.5112
2011-04-01	22.4706
2011-07-01	19.9996
2011-10-01	28.3679
2012-01-01	45.1391
2012-04-01	15.7249
2012-07-01	29.3960
2012-10-01	26.7522
2013-01-01	27.3782
2013-04-01	31.8351
2013-07-01	40.5515
2013-10-01	24.9669
2014-01-01	40.7115
2014-04-01	41.6071
2014-07-01	35.5510
2014-10-01	21.9396
2015-01-01	30.2435
2015-04-01	30.8070