Quarter	Billions of US Dollars
1971-01-01	0.0300
1972-04-01	0.0350
1974-04-01	0.0239
1974-07-01	0.0400
1974-10-01	0.0197
1975-01-01	0.0161
1975-04-01	0.2341
1975-07-01	0.0191
1976-01-01	0.1080
1976-07-01	0.1000
1976-10-01	0.0968
1977-04-01	0.1200
1977-07-01	0.1062
1978-01-01	0.0527
1978-07-01	0.0240
1978-10-01	0.0840
1979-01-01	0.1000
1979-07-01	0.1112
1979-10-01	-0.0283
1980-01-01	-0.0241
1980-04-01	-0.0115
1980-07-01	0.0096
1981-01-01	-0.1080
1981-07-01	0.0233
1981-10-01	0.0283
1982-04-01	0.1300
1982-07-01	-0.0150
1982-10-01	0.7000
1983-01-01	0.2000
1983-04-01	0.4724
1983-07-01	0.0520
1983-10-01	0.1606
1984-01-01	0.0507
1984-04-01	0.1000
1984-07-01	0.2850
1984-10-01	0.3777
1985-01-01	0.1028
1985-04-01	0.1206
1985-07-01	0.3088
1985-10-01	-0.0835
1986-01-01	0.5158
1986-04-01	0.3105
1986-07-01	0.5299
1986-10-01	0.1437
1987-01-01	0.3987
1987-04-01	0.5388
1987-07-01	0.0950
1987-10-01	0.0161
1988-01-01	-0.1712
1988-04-01	0.3310
1988-07-01	0.0576
1988-10-01	0.7449
1989-01-01	0.3513
1989-04-01	-0.2069
1989-07-01	-0.1931
1989-10-01	0.0792
1990-01-01	0.3961
1990-04-01	-0.3632
1990-07-01	0.2049
1990-10-01	0.3789
1991-01-01	0.5781
1991-04-01	1.9802
1991-07-01	0.9818
1991-10-01	0.3679
1992-01-01	0.7398
1992-04-01	0.0316
1992-07-01	0.0953
1992-10-01	1.0949
1993-01-01	0.4475
1993-04-01	1.2482
1993-07-01	1.7085
1993-10-01	0.2290
1994-01-01	1.3459
1994-04-01	-0.7984
1994-07-01	1.1683
1994-10-01	2.1327
1995-01-01	0.9496
1995-04-01	1.6571
1995-07-01	2.3411
1995-10-01	1.0633
1996-01-01	1.4738
1996-04-01	3.8120
1996-07-01	-0.4832
1996-10-01	0.7568
1997-01-01	3.1701
1997-04-01	2.9022
1997-07-01	5.6817
1997-10-01	5.9641
1998-01-01	2.9151
1998-04-01	7.0371
1998-07-01	3.2387
1998-10-01	-0.6933
1999-01-01	2.2436
1999-04-01	1.9754
1999-07-01	3.0612
1999-10-01	-1.4621
2000-01-01	-0.1078
2000-04-01	5.6608
2000-07-01	1.9703
2000-10-01	9.9493
2001-01-01	1.6190
2001-04-01	1.3859
2001-07-01	1.9590
2001-10-01	1.5918
2002-01-01	1.5442
2002-04-01	9.8575
2002-07-01	-0.7099
2002-10-01	2.1118
2003-01-01	1.1300
2003-04-01	-0.9311
2003-07-01	8.3515
2003-10-01	10.4370
2004-01-01	27.4571
2004-04-01	11.7691
2004-07-01	18.5294
2004-10-01	18.4964
2005-01-01	7.5174
2005-04-01	2.7799
2005-07-01	25.0430
2005-10-01	0.4781
2006-01-01	8.5668
2006-04-01	4.1337
2006-07-01	8.8135
2006-10-01	-6.4419
2007-01-01	17.9074
2007-04-01	20.2183
2007-07-01	11.3344
2007-10-01	-14.0562
2008-01-01	3.8286
2008-04-01	33.6512
2008-07-01	5.5365
2008-10-01	-18.6206
2009-01-01	24.0682
2009-04-01	13.6896
2009-07-01	1.1265
2009-10-01	-6.5159
2010-01-01	14.4996
2010-04-01	-6.5334
2010-07-01	6.9625
2010-10-01	-15.7483
2011-01-01	1.8788
2011-04-01	-8.0680
2011-07-01	-0.4968
2011-10-01	-2.5995
2012-01-01	10.7561
2012-04-01	-3.3274
2012-07-01	1.2992
2012-10-01	11.8619
2013-01-01	-15.6839
2013-04-01	-13.7246
2013-07-01	-10.3916
2013-10-01	-0.1996
2014-01-01	2.1645
2014-04-01	17.4596
2014-07-01	14.9166
2014-10-01	-0.8119
2015-01-01	5.5082
2015-04-01	20.4370