Quarter	Billions of US Dollars
1971-01-01	0.0856
1971-04-01	0.0506
1971-07-01	0.0245
1971-10-01	0.0812
1972-01-01	0.2527
1972-04-01	0.1544
1972-07-01	0.2187
1972-10-01	0.4155
1973-01-01	0.1607
1973-04-01	0.3915
1973-07-01	0.1301
1973-10-01	0.5440
1974-01-01	0.1299
1974-04-01	0.4932
1974-07-01	0.0673
1974-10-01	0.1663
1975-01-01	0.3551
1975-04-01	0.5532
1975-07-01	0.1872
1975-10-01	0.2088
1976-01-01	0.2038
1976-04-01	0.4784
1976-07-01	0.6265
1976-10-01	0.5982
1977-01-01	0.6936
1977-04-01	0.8644
1977-07-01	1.2608
1977-10-01	1.3380
1978-01-01	1.7437
1978-04-01	1.3862
1978-07-01	0.8641
1978-10-01	1.1499
1979-01-01	1.0196
1979-04-01	0.6657
1979-07-01	0.8502
1979-10-01	0.2531
1980-01-01	-0.0894
1980-04-01	0.6486
1980-07-01	0.5760
1980-10-01	0.2195
1981-01-01	0.1579
1981-04-01	0.6462
1981-07-01	0.5804
1981-10-01	0.9628
1982-01-01	1.0372
1982-04-01	0.2675
1982-07-01	-0.0714
1982-10-01	0.4672
1983-01-01	-0.3054
1983-04-01	0.0510
1983-07-01	1.2364
1983-10-01	-0.1015
1984-01-01	0.3197
1984-04-01	0.0519
1984-07-01	0.2034
1984-10-01	1.3517
1985-01-01	0.8563
1985-04-01	2.0735
1985-07-01	0.6392
1985-10-01	-0.1656
1986-01-01	1.0464
1986-04-01	0.3615
1986-07-01	0.1694
1986-10-01	-0.5226
1987-01-01	-0.0280
1987-04-01	-0.3020
1987-07-01	-0.1455
1987-10-01	-0.2015
1988-01-01	0.3559
1988-04-01	-0.6102
1988-07-01	0.5251
1988-10-01	0.8265
1989-01-01	0.4472
1989-04-01	-0.1457
1989-07-01	1.8656
1989-10-01	0.7170
1990-01-01	36.0464
1990-04-01	0.5123
1990-07-01	1.1869
1990-10-01	16.6803
1991-01-01	2.1291
1991-04-01	3.9752
1991-07-01	1.1919
1991-10-01	4.7250
1992-01-01	5.0592
1992-04-01	2.6373
1992-07-01	3.6755
1992-10-01	6.1473
1993-01-01	3.3694
1993-04-01	23.9284
1993-07-01	5.7849
1993-10-01	23.9229
1994-01-01	11.8851
1994-04-01	47.6542
1994-07-01	12.6445
1994-10-01	12.3977
1995-01-01	4.7547
1995-04-01	5.2848
1995-07-01	12.4032
1995-10-01	8.0777
1996-01-01	11.8346
1996-04-01	15.0341
1996-07-01	19.3823
1996-10-01	23.2017
1997-01-01	25.0714
1997-04-01	30.0835
1997-07-01	23.4498
1997-10-01	4.1138
1998-01-01	10.5952
1998-04-01	23.1505
1998-07-01	7.0888
1998-10-01	-24.3796
1999-01-01	3.2393
1999-04-01	15.8132
1999-07-01	0.2692
1999-10-01	9.8277
2000-01-01	19.9647
2000-04-01	3.2406
2000-07-01	35.2510
2000-10-01	-4.2352
2001-01-01	9.8791
2001-04-01	-1.9089
2001-07-01	-0.3144
2001-10-01	-1.3091
2002-01-01	6.4366
2002-04-01	2.8835
2002-07-01	1.7605
2002-10-01	3.3213
2003-01-01	0.2319
2003-04-01	4.8021
2003-07-01	7.6692
2003-10-01	8.3799
2004-01-01	17.5865
2004-04-01	9.8226
2004-07-01	6.8943
2004-10-01	15.2282
2005-01-01	21.3910
2005-04-01	-9.3705
2005-07-01	7.4393
2005-10-01	19.8036
2006-01-01	30.8878
2006-04-01	-8.6179
2006-07-01	18.9226
2006-10-01	35.5131
2007-01-01	23.9973
2007-04-01	40.1053
2007-07-01	6.4238
2007-10-01	17.8511
2008-01-01	-3.6914
2008-04-01	22.6416
2008-07-01	2.6200
2008-10-01	-18.5348
2009-01-01	4.5769
2009-04-01	19.1217
2009-07-01	35.2114
2009-10-01	40.8000
2010-01-01	24.7349
2010-04-01	29.7311
2010-07-01	37.4069
2010-10-01	38.9218
2011-01-01	46.5531
2011-04-01	37.7787
2011-07-01	17.6182
2011-10-01	37.8261
2012-01-01	42.6527
2012-04-01	44.2006
2012-07-01	63.3819
2012-10-01	71.7511
2013-01-01	35.1269
2013-04-01	50.2227
2013-07-01	50.7281
2013-10-01	71.7972
2014-01-01	23.0460
2014-04-01	56.8598
2014-07-01	44.9595
2014-10-01	64.2863
2015-01-01	32.9905
2015-04-01	48.6867