Quarter	Billions of US Dollars
1971-01-01	0.0250
1972-10-01	0.0300
1973-01-01	0.0522
1973-04-01	0.0200
1973-07-01	0.0719
1974-01-01	0.0234
1974-04-01	0.0587
1974-07-01	0.0157
1974-10-01	0.0364
1975-04-01	0.0344
1975-10-01	0.0384
1976-07-01	0.0202
1977-01-01	0.0300
1977-07-01	0.0566
1978-04-01	0.0833
1979-04-01	0.0393
1979-07-01	0.0126
1979-10-01	0.0665
1980-01-01	0.1163
1980-07-01	0.0116
1980-10-01	0.0950
1981-01-01	0.1000
1981-04-01	0.1000
1981-07-01	-0.0715
1981-10-01	0.3420
1982-01-01	0.3000
1982-04-01	0.1033
1982-07-01	0.1645
1982-10-01	0.0499
1983-01-01	0.2416
1983-04-01	0.0896
1983-07-01	0.0336
1983-10-01	0.6496
1984-01-01	0.0368
1984-04-01	0.0593
1984-07-01	0.3490
1984-10-01	0.2579
1985-01-01	0.3982
1985-04-01	0.1996
1985-07-01	0.2421
1985-10-01	0.3956
1986-01-01	0.1976
1986-04-01	0.5292
1986-07-01	1.0083
1986-10-01	-0.0031
1987-01-01	-0.2017
1987-04-01	0.1894
1987-07-01	-0.0992
1987-10-01	-0.3450
1988-01-01	0.2327
1988-04-01	0.1995
1988-07-01	-0.2573
1988-10-01	-0.0895
1989-01-01	-0.2678
1989-04-01	0.2498
1989-07-01	1.4754
1989-10-01	0.0163
1990-01-01	0.5140
1990-04-01	0.2491
1990-07-01	0.0150
1990-10-01	0.1885
1991-01-01	0.0673
1991-04-01	0.7688
1991-07-01	0.2318
1991-10-01	-0.0144
1992-01-01	0.3537
1992-04-01	-0.2612
1992-07-01	0.4520
1992-10-01	0.9733
1993-01-01	1.6832
1993-04-01	-0.3238
1993-07-01	-0.0951
1993-10-01	0.0341
1994-01-01	-0.6029
1994-04-01	0.3643
1994-07-01	-0.0970
1994-10-01	-0.2101
1995-01-01	0.5407
1995-04-01	0.7196
1995-07-01	0.7625
1995-10-01	2.4837
1996-01-01	0.2573
1996-04-01	1.1299
1996-07-01	1.8630
1996-10-01	3.3776
1997-01-01	4.1635
1997-04-01	1.8532
1997-07-01	1.4044
1997-10-01	2.3033
1998-01-01	1.1759
1998-04-01	2.1993
1998-07-01	0.9510
1998-10-01	-0.8198
1999-01-01	0.3534
1999-04-01	1.1613
1999-07-01	2.8934
1999-10-01	3.4233
2000-01-01	2.1695
2000-04-01	1.4069
2000-07-01	2.4491
2000-10-01	-0.0679
2001-01-01	5.9631
2001-04-01	3.0196
2001-07-01	0.5464
2001-10-01	3.6354
2002-01-01	2.7126
2002-04-01	2.5798
2002-07-01	2.0975
2002-10-01	5.9316
2003-01-01	8.4983
2003-04-01	12.0039
2003-07-01	14.2822
2003-10-01	30.6387
2004-01-01	17.7604
2004-04-01	19.5941
2004-07-01	24.5435
2004-10-01	29.5764
2005-01-01	29.7027
2005-04-01	46.7785
2005-07-01	11.6593
2005-10-01	39.7517
2006-01-01	38.1537
2006-04-01	63.3334
2006-07-01	73.0162
2006-10-01	74.4640
2007-01-01	52.0719
2007-04-01	93.2646
2007-07-01	56.8819
2007-10-01	37.5049
2008-01-01	34.6366
2008-04-01	33.9221
2008-07-01	17.2637
2008-10-01	74.7665
2009-01-01	33.1334
2009-04-01	36.9912
2009-07-01	34.7792
2009-10-01	-2.6726
2010-01-01	17.1606
2010-04-01	-7.0494
2010-07-01	-25.5476
2010-10-01	-7.1446
2011-01-01	-42.9215
2011-04-01	-8.8673
2011-07-01	-23.8665
2011-10-01	-2.8601
2012-01-01	-10.3607
2012-04-01	-23.5594
2012-07-01	-17.6973
2012-10-01	4.3235
2013-01-01	3.1514
2013-04-01	-15.7033
2013-07-01	-18.1532
2013-10-01	7.0032
2014-01-01	0.4867
2014-04-01	-4.7767
2014-07-01	-20.4162
2014-10-01	-45.0409
2015-01-01	-29.0471
2015-04-01	28.0186