Quarter	Billions of US Dollars
1971-01-01	0.0150
1971-10-01	0.0484
1972-01-01	0.0786
1972-04-01	0.0315
1972-07-01	0.1204
1972-10-01	0.0662
1973-01-01	0.0710
1973-04-01	0.0131
1973-07-01	0.0693
1974-01-01	0.0313
1974-04-01	0.0017
1974-10-01	0.0597
1975-01-01	0.1465
1975-04-01	0.0279
1975-07-01	0.1546
1975-10-01	0.0872
1976-01-01	0.0672
1976-04-01	0.0347
1976-07-01	0.0654
1976-10-01	0.1808
1977-01-01	0.0576
1977-04-01	0.1102
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	0.3009
1979-04-01	0.1383
1979-07-01	0.0294
1979-10-01	0.1635
1980-01-01	-0.0063
1980-04-01	0.0705
1980-07-01	-0.0244
1980-10-01	-0.0081
1981-01-01	0.0136
1981-04-01	0.2593
1981-07-01	0.0250
1981-10-01	0.2048
1982-01-01	0.0946
1982-04-01	0.2247
1982-07-01	0.1845
1982-10-01	0.1508
1983-01-01	0.1241
1983-04-01	0.1850
1983-07-01	0.1176
1983-10-01	-0.0219
1984-01-01	0.2923
1984-04-01	0.2682
1984-07-01	0.2310
1984-10-01	0.2296
1985-01-01	0.2795
1985-04-01	0.1670
1985-07-01	0.1577
1985-10-01	-0.1662
1986-01-01	0.4762
1986-04-01	0.4250
1986-07-01	0.6748
1986-10-01	0.4678
1987-01-01	0.9671
1987-04-01	0.4503
1987-07-01	-0.1425
1987-10-01	0.7197
1988-01-01	0.6381
1988-04-01	1.3081
1988-07-01	0.1772
1988-10-01	1.1579
1989-01-01	1.5021
1989-04-01	0.6145
1989-07-01	0.4312
1989-10-01	0.9369
1990-01-01	1.1751
1990-04-01	1.3381
1990-07-01	1.5348
1990-10-01	1.7524
1991-01-01	1.1641
1991-04-01	1.4027
1991-07-01	1.0815
1991-10-01	0.9580
1992-01-01	1.2034
1992-04-01	3.8864
1992-07-01	2.1678
1992-10-01	2.8610
1993-01-01	2.1796
1993-04-01	0.8535
1993-07-01	-0.1336
1993-10-01	-0.6533
1994-01-01	1.2670
1994-04-01	1.6635
1994-07-01	3.6469
1994-10-01	0.2563
1995-01-01	0.4519
1995-04-01	-0.8444
1995-07-01	-0.7619
1995-10-01	-1.5142
1996-01-01	1.1410
1996-04-01	-1.2582
1996-07-01	-0.8968
1996-10-01	0.4872
1997-01-01	1.4141
1997-04-01	-0.9222
1997-07-01	-0.9780
1997-10-01	-2.4802
1998-01-01	-2.0598
1998-04-01	0.6490
1998-07-01	-0.4647
1998-10-01	-2.4686
1999-01-01	-0.8665
1999-04-01	0.3848
1999-07-01	0.4362
1999-10-01	-0.8171
2000-01-01	-1.0081
2000-04-01	0.8535
2000-07-01	-0.4565
2000-10-01	-2.0467
2001-01-01	-0.7124
2001-04-01	5.1298
2001-07-01	-1.0585
2001-10-01	-0.2370
2002-01-01	0.9595
2002-04-01	-0.8972
2002-07-01	-1.2907
2002-10-01	0.2706
2003-01-01	6.9348
2003-04-01	4.5765
2003-07-01	1.6634
2003-10-01	0.2759
2004-01-01	3.3637
2004-04-01	1.6583
2004-07-01	-2.0359
2004-10-01	1.5971
2005-01-01	-0.3537
2005-04-01	0.7786
2005-07-01	1.5352
2005-10-01	1.6484
2006-01-01	1.2457
2006-04-01	3.7180
2006-07-01	-6.5593
2006-10-01	1.5695
2007-01-01	-2.6535
2007-04-01	1.3549
2007-07-01	-6.9048
2007-10-01	-1.3924
2008-01-01	-1.7490
2008-04-01	0.5154
2008-07-01	-4.7595
2008-10-01	-0.6025
2009-01-01	3.6456
2009-04-01	1.0824
2009-07-01	2.2747
2009-10-01	1.8082
2010-01-01	4.3046
2010-04-01	-0.7952
2010-07-01	0.7357
2010-10-01	6.9114
2011-01-01	15.8593
2011-04-01	5.5833
2011-07-01	2.5841
2011-10-01	1.9751
2012-01-01	12.2231
2012-04-01	9.3115
2012-07-01	0.0858
2012-10-01	4.7924
2013-01-01	4.4490
2013-04-01	4.8508
2013-07-01	6.7563
2013-10-01	6.3155
2014-01-01	5.6095
2014-04-01	6.2355
2014-07-01	4.6172
2014-10-01	1.7179
2015-01-01	4.1660
2015-04-01	7.1821