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	0.2806
1980-01-01	-0.0468
1980-04-01	0.5510
1980-07-01	0.2878
1980-10-01	0.2621
1981-01-01	0.1697
1981-04-01	0.7805
1981-07-01	0.4805
1981-10-01	0.8702
1982-01-01	0.6130
1982-04-01	-0.1786
1982-07-01	-0.0088
1982-10-01	-0.0934
1983-01-01	-0.4325
1983-04-01	-0.1530
1983-07-01	-0.0421
1983-10-01	-0.2348
1984-01-01	-0.1444
1984-04-01	-0.1535
1984-07-01	-0.3384
1984-10-01	-0.1223
1985-01-01	-0.0237
1985-04-01	-0.0487
1985-07-01	-0.0728
1985-10-01	-1.0136
1986-01-01	-0.0813
1986-04-01	-0.3760
1986-07-01	-0.1575
1986-10-01	-0.5914
1987-01-01	-0.5120
1987-04-01	-0.2483
1987-07-01	-0.3279
1987-10-01	-0.5561
1988-01-01	-0.1407
1988-04-01	-0.8586
1988-07-01	-0.8277
1988-10-01	-0.2347
1989-01-01	-0.1392
1989-04-01	-0.0900
1989-07-01	0.7277
1989-10-01	-0.4171
1990-01-01	35.3148
1990-04-01	0.7675
1990-07-01	0.2838
1990-10-01	16.3847
1991-01-01	1.5071
1991-04-01	1.1165
1991-07-01	1.0524
1991-10-01	2.3339
1992-01-01	1.1038
1992-04-01	2.1212
1992-07-01	1.0057
1992-10-01	2.1559
1993-01-01	1.1010
1993-04-01	21.5667
1993-07-01	3.6909
1993-10-01	16.1575
1994-01-01	5.9876
1994-04-01	44.3720
1994-07-01	2.4928
1994-10-01	3.7881
1995-01-01	4.5844
1995-04-01	3.3293
1995-07-01	4.4624
1995-10-01	4.1036
1996-01-01	6.5632
1996-04-01	8.7988
1996-07-01	11.1279
1996-10-01	7.7636
1997-01-01	14.5848
1997-04-01	13.8771
1997-07-01	10.8671
1997-10-01	0.2863
1998-01-01	7.1807
1998-04-01	13.4582
1998-07-01	3.0910
1998-10-01	-20.6548
1999-01-01	2.6695
1999-04-01	13.3556
1999-07-01	5.3513
1999-10-01	8.4543
2000-01-01	14.9857
2000-04-01	-1.5260
2000-07-01	16.1007
2000-10-01	-4.5479
2001-01-01	11.5594
2001-04-01	-4.1102
2001-07-01	3.0608
2001-10-01	-3.4906
2002-01-01	5.3679
2002-04-01	-3.6444
2002-07-01	0.2306
2002-10-01	1.1097
2003-01-01	-5.9393
2003-04-01	0.8136
2003-07-01	-0.1191
2003-10-01	4.8087
2004-01-01	6.4064
2004-04-01	-2.8755
2004-07-01	1.7245
2004-10-01	3.2771
2005-01-01	7.3657
2005-04-01	-29.6183
2005-07-01	3.2806
2005-10-01	8.1238
2006-01-01	4.7578
2006-04-01	-17.2216
2006-07-01	4.8704
2006-10-01	12.6136
2007-01-01	6.2485
2007-04-01	15.8705
2007-07-01	-5.2530
2007-10-01	6.1565
2008-01-01	-5.3101
2008-04-01	3.9896
2008-07-01	-4.2099
2008-10-01	-11.1504
2009-01-01	-0.1497
2009-04-01	-2.9001
2009-07-01	17.5465
2009-10-01	32.8882
2010-01-01	12.0908
2010-04-01	14.9404
2010-07-01	23.2392
2010-10-01	12.3076
2011-01-01	21.2301
2011-04-01	17.9318
2011-07-01	10.5189
2011-10-01	25.4511
2012-01-01	33.5395
2012-04-01	12.4462
2012-07-01	22.6148
2012-10-01	24.0709
2013-01-01	17.9830
2013-04-01	28.7213
2013-07-01	23.0276
2013-10-01	25.4069
2014-01-01	23.9862
2014-04-01	35.3953
2014-07-01	28.7023
2014-10-01	4.7305
2015-01-01	6.9616
2015-04-01	22.1075