Quarter	Billions of US Dollars
1971-01-01	0.0150
1971-10-01	0.0684
1972-01-01	0.0586
1972-04-01	0.0498
1972-07-01	0.1021
1972-10-01	0.0812
1973-01-01	0.0480
1973-04-01	0.0159
1973-07-01	0.0665
1974-01-01	0.0313
1974-04-01	0.0017
1974-10-01	0.0716
1975-01-01	0.1405
1975-04-01	0.0220
1975-07-01	0.1696
1975-10-01	0.0722
1976-01-01	0.0672
1976-04-01	0.0454
1976-07-01	0.0654
1976-10-01	0.1808
1977-01-01	0.0576
1977-04-01	0.0695
1977-07-01	0.0732
1977-10-01	0.1859
1978-01-01	0.3265
1978-04-01	0.2963
1978-07-01	0.1531
1978-10-01	0.2421
1979-01-01	0.3209
1979-04-01	0.1383
1979-07-01	0.0444
1979-10-01	0.1820
1980-01-01	0.0795
1980-04-01	0.1180
1980-07-01	0.0485
1980-10-01	0.0313
1981-01-01	0.0336
1981-04-01	0.2593
1981-07-01	0.0450
1981-10-01	0.2641
1982-01-01	0.2375
1982-04-01	0.0747
1982-07-01	0.2021
1982-10-01	0.1919
1983-01-01	0.1996
1983-04-01	0.3600
1983-07-01	0.1551
1983-10-01	0.1284
1984-01-01	0.4701
1984-04-01	0.2632
1984-07-01	0.1785
1984-10-01	0.2028
1985-01-01	0.5014
1985-04-01	0.0530
1985-07-01	0.3139
1985-10-01	0.2523
1986-01-01	0.7310
1986-04-01	0.4218
1986-07-01	0.7745
1986-10-01	0.6142
1987-01-01	0.8235
1987-04-01	0.6659
1987-07-01	0.3435
1987-10-01	0.7418
1988-01-01	1.4456
1988-04-01	0.9695
1988-07-01	0.7965
1988-10-01	0.3242
1989-01-01	1.4370
1989-04-01	1.0924
1989-07-01	0.2867
1989-10-01	0.9683
1990-01-01	0.5711
1990-04-01	2.1341
1990-07-01	1.1875
1990-10-01	1.7606
1991-01-01	2.0682
1991-04-01	1.7986
1991-07-01	2.1785
1991-10-01	1.3987
1992-01-01	3.5045
1992-04-01	4.4725
1992-07-01	2.3838
1992-10-01	4.4131
1993-01-01	4.5879
1993-04-01	1.9503
1993-07-01	0.4934
1993-10-01	0.6645
1994-01-01	2.2784
1994-04-01	3.1698
1994-07-01	4.2671
1994-10-01	1.0854
1995-01-01	1.4644
1995-04-01	0.3397
1995-07-01	0.1565
1995-10-01	1.0440
1996-01-01	2.9136
1996-04-01	7.7379
1996-07-01	7.2034
1996-10-01	1.7560
1997-01-01	2.5477
1997-04-01	1.5019
1997-07-01	0.9213
1997-10-01	1.4549
1998-01-01	0.1807
1998-04-01	2.4432
1998-07-01	0.6920
1998-10-01	1.6386
1999-01-01	0.5525
1999-04-01	0.8327
1999-07-01	1.5692
1999-10-01	1.0629
2000-01-01	1.4763
2000-04-01	1.8023
2000-07-01	1.2602
2000-10-01	1.2589
2001-01-01	1.4771
2001-04-01	5.8438
2001-07-01	0.2723
2001-10-01	1.0453
2002-01-01	2.6458
2002-04-01	0.7860
2002-07-01	0.1179
2002-10-01	1.2795
2003-01-01	7.8512
2003-04-01	6.9146
2003-07-01	3.2060
2003-10-01	1.9026
2004-01-01	4.2056
2004-04-01	2.1472
2004-07-01	1.3238
2004-10-01	2.3043
2005-01-01	2.6025
2005-04-01	2.3151
2005-07-01	0.1599
2005-10-01	2.2141
2006-01-01	4.7376
2006-04-01	4.5717
2006-07-01	0.7828
2006-10-01	3.4596
2007-01-01	1.7928
2007-04-01	4.7108
2007-07-01	0.5835
2007-10-01	1.1461
2008-01-01	2.0455
2008-04-01	2.7492
2008-07-01	3.5375
2008-10-01	0.8798
2009-01-01	7.7901
2009-04-01	9.7171
2009-07-01	2.9787
2009-10-01	4.4253
2010-01-01	7.0855
2010-04-01	3.6227
2010-07-01	4.1432
2010-10-01	6.2451
2011-01-01	17.0571
2011-04-01	8.5353
2011-07-01	3.2294
2011-10-01	2.7216
2012-01-01	11.0842
2012-04-01	10.2402
2012-07-01	5.7462
2012-10-01	5.7473
2013-01-01	8.9953
2013-04-01	9.5575
2013-07-01	8.7091
2013-10-01	6.7486
2014-01-01	9.0438
2014-04-01	15.0672
2014-07-01	7.8534
2014-10-01	5.5349
2015-01-01	9.0433
2015-04-01	10.5345