Quarter	Billions of US Dollars
1969-01-01	0.0950
1969-04-01	0.0150
1971-10-01	0.0600
1972-01-01	0.2020
1972-07-01	0.1042
1973-01-01	0.1044
1973-04-01	0.0474
1973-07-01	0.0783
1974-01-01	0.0189
1974-04-01	0.0847
1974-07-01	0.1715
1974-10-01	0.2771
1975-01-01	0.1696
1975-04-01	0.3782
1975-07-01	0.1653
1975-10-01	0.0586
1976-01-01	0.3350
1976-04-01	0.3171
1976-07-01	0.1139
1976-10-01	0.0801
1977-01-01	0.5653
1977-04-01	0.2130
1977-07-01	0.2181
1977-10-01	0.5742
1978-01-01	0.2991
1978-04-01	0.1273
1978-07-01	0.1593
1978-10-01	0.0335
1979-01-01	0.4950
1979-04-01	0.0846
1979-07-01	-0.1659
1979-10-01	-0.1417
1980-01-01	-0.0549
1980-04-01	0.4275
1980-07-01	0.2735
1980-10-01	0.2974
1981-01-01	0.2536
1981-04-01	-0.0212
1981-07-01	0.0808
1981-10-01	0.2053
1982-01-01	-0.0218
1982-04-01	0.2226
1982-07-01	0.3615
1982-10-01	0.3697
1983-01-01	0.1191
1983-04-01	0.0205
1983-07-01	0.3047
1983-10-01	0.2086
1984-01-01	0.2463
1984-04-01	0.0306
1984-07-01	0.0689
1984-10-01	0.5017
1985-01-01	-0.0892
1985-04-01	0.2411
1985-07-01	0.2137
1985-10-01	0.1944
1986-01-01	0.7567
1986-04-01	0.3450
1986-07-01	0.4976
1986-10-01	0.9521
1987-01-01	-0.3906
1987-04-01	0.4337
1987-07-01	-0.0913
1987-10-01	-0.2571
1988-01-01	0.2984
1988-04-01	0.5420
1988-07-01	0.4267
1988-10-01	0.4205
1989-01-01	-0.0529
1989-04-01	0.8869
1989-07-01	0.5655
1989-10-01	0.5851
1990-01-01	1.2130
1990-04-01	0.0883
1990-07-01	-0.0868
1990-10-01	0.7749
1991-01-01	1.1579
1991-04-01	0.4127
1991-07-01	1.5820
1991-10-01	1.7215
1992-01-01	1.3542
1992-04-01	2.0093
1992-07-01	0.8512
1992-10-01	1.0811
1993-01-01	0.6831
1993-04-01	1.6432
1993-07-01	2.3088
1993-10-01	2.0907
1994-01-01	1.8718
1994-04-01	1.7855
1994-07-01	5.3354
1994-10-01	2.9345
1995-01-01	2.5637
1995-04-01	2.6777
1995-07-01	2.0565
1995-10-01	2.1126
1996-01-01	5.2638
1996-04-01	7.0179
1996-07-01	3.9035
1996-10-01	5.1271
1997-01-01	5.7516
1997-04-01	4.1309
1997-07-01	8.7756
1997-10-01	3.0946
1998-01-01	6.9431
1998-04-01	6.2315
1998-07-01	9.0353
1998-10-01	6.1480
1999-01-01	8.1687
1999-04-01	12.2408
1999-07-01	13.3083
1999-10-01	6.0081
2000-01-01	6.3494
2000-04-01	13.1585
2000-07-01	10.6974
2000-10-01	32.8668
2001-01-01	8.5786
2001-04-01	15.2300
2001-07-01	6.0286
2001-10-01	18.1875
2002-01-01	12.4242
2002-04-01	12.0577
2002-07-01	15.9115
2002-10-01	9.5552
2003-01-01	16.3377
2003-04-01	26.6665
2003-07-01	13.9808
2003-10-01	25.0948
2004-01-01	16.9956
2004-04-01	16.1302
2004-07-01	9.7292
2004-10-01	22.8128
2005-01-01	21.1106
2005-04-01	23.2148
2005-07-01	14.0187
2005-10-01	38.6633
2006-01-01	26.3938
2006-04-01	27.4072
2006-07-01	31.5301
2006-10-01	40.6197
2007-01-01	33.4422
2007-04-01	30.1901
2007-07-01	5.1631
2007-10-01	12.4252
2008-01-01	14.1853
2008-04-01	50.9627
2008-07-01	-6.6768
2008-10-01	24.0569
2009-01-01	47.4605
2009-04-01	52.0416
2009-07-01	8.6530
2009-10-01	15.1408
2010-01-01	60.0509
2010-04-01	-3.6002
2010-07-01	44.3152
2010-10-01	11.2687
2011-01-01	15.1592
2011-04-01	20.3329
2011-07-01	12.8879
2011-10-01	41.0846
2012-01-01	5.2439
2012-04-01	5.5799
2012-07-01	12.6775
2012-10-01	5.6452
2013-01-01	-5.0232
2013-04-01	9.8454
2013-07-01	21.0797
2013-10-01	-29.0005
2014-01-01	13.9682
2014-04-01	6.6091
2014-07-01	8.7098
2014-10-01	-0.5890
2015-01-01	-4.2752
2015-04-01	18.7970