Quarter	Billions of US Dollars
1971-01-01	0.0456
1971-04-01	0.0306
1971-07-01	0.0306
1972-04-01	0.0315
1973-04-01	0.0143
1973-10-01	0.0100
1974-01-01	0.0317
1974-04-01	0.0825
1974-10-01	0.1533
1975-01-01	0.4168
1975-04-01	0.4427
1975-07-01	0.2122
1975-10-01	0.4410
1976-01-01	0.7695
1976-04-01	0.7286
1976-07-01	0.2054
1976-10-01	0.3717
1977-01-01	0.5577
1977-04-01	0.5655
1977-07-01	0.2701
1977-10-01	0.4268
1978-01-01	0.4729
1978-04-01	0.6600
1978-07-01	0.8147
1978-10-01	0.7947
1979-01-01	1.2595
1979-04-01	1.0598
1979-07-01	1.0008
1979-10-01	0.1684
1980-01-01	0.2955
1980-04-01	0.4472
1980-07-01	0.7406
1980-10-01	1.0237
1981-01-01	0.3452
1981-04-01	0.6443
1981-07-01	1.5752
1981-10-01	0.7715
1982-01-01	1.1404
1982-04-01	0.7276
1982-07-01	0.8463
1982-10-01	1.4582
1983-01-01	2.1286
1983-04-01	2.0671
1983-07-01	1.3197
1983-10-01	1.8821
1984-01-01	3.2674
1984-04-01	2.1122
1984-07-01	2.8672
1984-10-01	1.7594
1985-01-01	4.2420
1985-04-01	2.6867
1985-07-01	4.0094
1985-10-01	3.3637
1986-01-01	3.8150
1986-04-01	6.2331
1986-07-01	6.3576
1986-10-01	6.6086
1987-01-01	5.4929
1987-04-01	9.6248
1987-07-01	13.6087
1987-10-01	3.5568
1988-01-01	5.4247
1988-04-01	7.5039
1988-07-01	15.7154
1988-10-01	6.1148
1989-01-01	17.6888
1989-04-01	28.2696
1989-07-01	14.5724
1989-10-01	18.1984
1990-01-01	7.6835
1990-04-01	0.3955
1990-07-01	10.9310
1990-10-01	10.2243
1991-01-01	6.9063
1991-04-01	10.3493
1991-07-01	12.2269
1991-10-01	9.6572
1992-01-01	1.9155
1992-04-01	-0.3508
1992-07-01	-9.5483
1992-10-01	3.7379
1993-01-01	-13.5986
1993-04-01	-17.1268
1993-07-01	-12.4732
1993-10-01	-3.1635
1994-01-01	-1.8708
1994-04-01	-6.4550
1994-07-01	-8.5505
1994-10-01	-9.0187
1995-01-01	-6.1986
1995-04-01	-6.9519
1995-07-01	-14.5672
1995-10-01	-3.3871
1996-01-01	-3.1521
1996-04-01	-2.7159
1996-07-01	-4.0031
1996-10-01	-7.0074
1997-01-01	-6.4283
1997-04-01	-6.2563
1997-07-01	-7.8391
1997-10-01	-10.7053
1998-01-01	-10.5901
1998-04-01	-9.3676
1998-07-01	-6.0709
1998-10-01	-2.8656
1999-01-01	-1.8394
1999-04-01	-0.4591
1999-07-01	-1.0480
1999-10-01	-6.8610
2000-01-01	-7.9467
2000-04-01	-0.7904
2000-07-01	-1.3337
2000-10-01	-3.2067
2001-01-01	-3.0203
2001-04-01	0.3782
2001-07-01	-2.8267
2001-10-01	0.9517
2002-01-01	1.4416
2002-04-01	4.0159
2002-07-01	-1.8709
2002-10-01	-2.4836
2003-01-01	-0.9795
2003-04-01	1.3651
2003-07-01	-2.3696
2003-10-01	7.7876
2004-01-01	3.8858
2004-04-01	8.2126
2004-07-01	0.9761
2004-10-01	1.8343
2005-01-01	3.7876
2005-04-01	2.8839
2005-07-01	6.0421
2005-10-01	0.5016
2006-01-01	3.4134
2006-04-01	1.6831
2006-07-01	-0.1483
2006-10-01	3.0470
2007-01-01	-1.2606
2007-04-01	2.7828
2007-07-01	0.6731
2007-10-01	4.3555
2008-01-01	-0.8611
2008-04-01	3.9155
2008-07-01	-1.2573
2008-10-01	-5.1228
2009-01-01	-5.2408
2009-04-01	-5.8290
2009-07-01	-1.5809
2009-10-01	-0.8047
2010-01-01	3.5854
2010-04-01	-6.4577
2010-07-01	6.3693
2010-10-01	-1.3240
2011-01-01	2.5081
2011-04-01	-8.5151
2011-07-01	-0.8029
2011-10-01	-0.7639
2012-01-01	6.9125
2012-04-01	-4.5672
2012-07-01	9.4221
2012-10-01	2.3200
2013-01-01	8.7895
2013-04-01	4.6722
2013-07-01	18.1985
2013-10-01	3.9498
2014-01-01	5.9051
2014-04-01	12.0810
2014-07-01	13.9438
2014-10-01	8.4616
2015-01-01	8.2839
2015-04-01	-0.6520