Quarter	Billions of US Dollars
1971-01-01	0.0856
1971-04-01	0.0506
1971-07-01	0.0245
1971-10-01	0.0506
1972-01-01	0.1212
1972-04-01	0.0778
1972-07-01	0.1174
1972-10-01	0.1907
1973-01-01	0.0354
1973-04-01	0.2999
1973-07-01	0.0544
1973-10-01	0.4014
1974-01-01	0.1087
1974-04-01	0.4245
1974-07-01	0.0654
1974-10-01	0.0724
1975-01-01	0.1026
1975-04-01	0.3261
1975-07-01	0.1382
1975-10-01	0.1106
1976-01-01	0.1001
1976-04-01	0.2113
1976-07-01	0.1105
1976-10-01	0.2393
1977-01-01	0.2175
1977-04-01	0.1954
1977-07-01	0.1723
1977-10-01	0.2427
1978-01-01	0.3872
1978-04-01	0.4783
1978-07-01	0.3750
1978-10-01	0.4844
1979-01-01	0.2318
1979-04-01	0.2623
1979-07-01	0.1171
1979-10-01	-0.0355
1980-01-01	-0.0176
1980-04-01	-0.0433
1980-07-01	0.1495
1980-10-01	-0.0500
1981-01-01	0.0252
1981-04-01	-0.0602
1981-07-01	0.0800
1981-10-01	-0.0478
1982-01-01	-0.0208
1982-04-01	0.1306
1982-07-01	-0.0660
1982-10-01	0.0940
1983-01-01	0.1344
1983-04-01	0.1008
1983-07-01	0.0402
1983-10-01	0.0164
1984-01-01	-0.0171
1984-04-01	0.2337
1984-07-01	0.1495
1984-10-01	0.3396
1985-01-01	0.1069
1985-04-01	0.7531
1985-07-01	-0.0239
1985-10-01	-1.1315
1986-01-01	-0.2158
1986-04-01	-0.1117
1986-07-01	0.0050
1986-10-01	-0.2588
1987-01-01	-0.2040
1987-04-01	-0.2299
1987-07-01	-0.3649
1987-10-01	-0.5092
1988-01-01	-0.1861
1988-04-01	-0.2512
1988-07-01	-0.0883
1988-10-01	0.0186
1989-01-01	-0.2301
1989-04-01	-0.4343
1989-07-01	0.1408
1989-10-01	-0.0678
1990-01-01	-0.1816
1990-04-01	-0.7637
1990-07-01	-0.4185
1990-10-01	-0.3194
1991-01-01	-0.3114
1991-04-01	0.8349
1991-07-01	-0.1698
1991-10-01	0.1137
1992-01-01	2.4090
1992-04-01	0.1404
1992-07-01	-0.2550
1992-10-01	-0.2759
1993-01-01	-0.0661
1993-04-01	-0.5166
1993-07-01	-0.0990
1993-10-01	0.6951
1994-01-01	0.6636
1994-04-01	-0.3878
1994-07-01	0.2550
1994-10-01	0.6963
1995-01-01	0.4080
1995-04-01	0.1607
1995-07-01	0.5263
1995-10-01	0.5249
1996-01-01	0.5536
1996-04-01	0.1427
1996-07-01	0.6250
1996-10-01	2.5726
1997-01-01	-0.0667
1997-04-01	1.3739
1997-07-01	1.2031
1997-10-01	0.8711
1998-01-01	1.7614
1998-04-01	0.6594
1998-07-01	0.5377
1998-10-01	0.3004
1999-01-01	1.1386
1999-04-01	2.7447
1999-07-01	0.5359
1999-10-01	0.5647
2000-01-01	1.9150
2000-04-01	1.8527
2000-07-01	1.1426
2000-10-01	-0.1852
2001-01-01	0.5403
2001-04-01	2.3530
2001-07-01	2.5722
2001-10-01	0.5354
2002-01-01	0.7388
2002-04-01	2.8160
2002-07-01	0.0074
2002-10-01	1.0057
2003-01-01	1.3133
2003-04-01	2.2257
2003-07-01	4.6241
2003-10-01	0.1830
2004-01-01	5.9714
2004-04-01	1.9000
2004-07-01	0.8942
2004-10-01	2.2459
2005-01-01	1.6949
2005-04-01	2.6410
2005-07-01	5.8894
2005-10-01	5.0546
2006-01-01	9.6032
2006-04-01	6.3417
2006-07-01	3.1492
2006-10-01	16.1166
2007-01-01	7.9640
2007-04-01	9.4774
2007-07-01	9.4022
2007-10-01	9.5196
2008-01-01	-1.6674
2008-04-01	9.6607
2008-07-01	3.8300
2008-10-01	-1.1273
2009-01-01	-2.3214
2009-04-01	14.7209
2009-07-01	11.7406
2009-10-01	10.5139
2010-01-01	3.6832
2010-04-01	3.7774
2010-07-01	9.4820
2010-10-01	13.2621
2011-01-01	11.4924
2011-04-01	-0.1480
2011-07-01	-2.5954
2011-10-01	17.8712
2012-01-01	7.2409
2012-04-01	-1.4641
2012-07-01	8.7077
2012-10-01	18.7625
2013-01-01	10.0650
2013-04-01	5.1295
2013-07-01	7.2542
2013-10-01	12.7361
2014-01-01	3.5906
2014-04-01	13.2517
2014-07-01	5.7872
2014-10-01	5.5464
2015-01-01	13.1552
2015-04-01	10.9287