Quarter	Billions of US Dollars
1971-01-01	0.0150
1972-01-01	0.0728
1972-07-01	0.0276
1972-10-01	0.0200
1973-01-01	0.0496
1973-04-01	0.0491
1973-07-01	0.0100
1974-01-01	0.0147
1974-07-01	0.0083
1974-10-01	0.0414
1975-01-01	0.1599
1975-04-01	0.2024
1975-07-01	0.2308
1975-10-01	0.5208
1976-01-01	0.4941
1976-04-01	0.2685
1976-07-01	0.2436
1976-10-01	0.3414
1977-01-01	0.8139
1977-04-01	0.8574
1977-07-01	0.1841
1977-10-01	0.7915
1978-01-01	0.8535
1978-04-01	0.7683
1978-07-01	0.2498
1978-10-01	0.7326
1979-01-01	0.6520
1979-04-01	0.4105
1979-07-01	0.4957
1979-10-01	0.1989
1980-01-01	0.3396
1980-04-01	0.0596
1980-07-01	-0.0954
1980-10-01	-0.2315
1981-01-01	-0.2417
1981-04-01	-0.1450
1981-07-01	-0.0186
1981-10-01	0.1127
1982-01-01	-0.5095
1982-04-01	-0.1569
1982-07-01	0.1980
1982-10-01	-0.1535
1983-01-01	-0.1784
1983-04-01	-0.4082
1983-07-01	0.0925
1983-10-01	-0.2581
1984-01-01	0.0201
1984-04-01	-0.1083
1984-07-01	0.1722
1984-10-01	0.3151
1985-01-01	0.0191
1985-04-01	0.1864
1985-07-01	0.8243
1985-10-01	-0.6103
1986-01-01	0.4583
1986-04-01	0.8428
1986-07-01	1.7967
1986-10-01	1.1617
1987-01-01	1.6449
1987-04-01	0.9569
1987-07-01	-0.1495
1987-10-01	-0.2647
1988-01-01	1.1489
1988-04-01	1.6375
1988-07-01	0.6067
1988-10-01	0.1438
1989-01-01	1.2396
1989-04-01	0.0931
1989-07-01	-0.1739
1989-10-01	0.5791
1990-01-01	-0.6507
1990-04-01	-0.2518
1990-07-01	-0.5569
1990-10-01	-0.2825
1991-01-01	-0.7454
1991-04-01	-0.3924
1991-07-01	0.6425
1991-10-01	-0.0260
1992-01-01	0.0397
1992-04-01	1.1588
1992-07-01	-0.4530
1992-10-01	-0.5831
1993-01-01	-0.4394
1993-04-01	0.3151
1993-07-01	-0.5871
1993-10-01	-0.3858
1994-01-01	-0.6608
1994-04-01	-0.3452
1994-07-01	0.0276
1994-10-01	-0.4668
1995-01-01	-0.6123
1995-04-01	-0.9231
1995-07-01	0.1299
1995-10-01	0.2249
1996-01-01	0.3974
1996-04-01	0.4992
1996-07-01	-0.7067
1996-10-01	0.7018
1997-01-01	-0.6841
1997-04-01	-0.5387
1997-07-01	3.8975
1997-10-01	0.8011
1998-01-01	0.8296
1998-04-01	3.2173
1998-07-01	0.6586
1998-10-01	1.1806
1999-01-01	1.1943
1999-04-01	1.8088
1999-07-01	0.2879
1999-10-01	0.5674
2000-01-01	1.7413
2000-04-01	2.7742
2000-07-01	-0.1987
2000-10-01	0.8939
2001-01-01	1.6327
2001-04-01	1.2288
2001-07-01	0.3777
2001-10-01	1.7155
2002-01-01	1.1532
2002-04-01	1.6351
2002-07-01	-0.8911
2002-10-01	1.6515
2003-01-01	3.0181
2003-04-01	1.5944
2003-07-01	3.4008
2003-10-01	2.2265
2004-01-01	1.6366
2004-04-01	2.8981
2004-07-01	-0.0752
2004-10-01	3.0610
2005-01-01	2.5944
2005-04-01	2.2956
2005-07-01	0.3615
2005-10-01	4.3784
2006-01-01	2.7999
2006-04-01	8.4978
2006-07-01	7.2247
2006-10-01	7.3782
2007-01-01	5.4675
2007-04-01	1.4328
2007-07-01	5.4772
2007-10-01	5.8506
2008-01-01	8.3000
2008-04-01	16.2575
2008-07-01	2.7760
2008-10-01	-1.3583
2009-01-01	5.0269
2009-04-01	5.5113
2009-07-01	3.1536
2009-10-01	3.2031
2010-01-01	7.5715
2010-04-01	6.4693
2010-07-01	5.5142
2010-10-01	1.5587
2011-01-01	15.3530
2011-04-01	5.6790
2011-07-01	5.4753
2011-10-01	7.6764
2012-01-01	14.0973
2012-04-01	10.2887
2012-07-01	3.0537
2012-10-01	7.5615
2013-01-01	5.6281
2013-04-01	8.6912
2013-07-01	3.4594
2013-10-01	7.8072
2014-01-01	0.8691
2014-04-01	-5.0624
2014-07-01	1.0682
2014-10-01	3.5109
2015-01-01	6.0835
2015-04-01	-8.0097