Quarter	Billions of US Dollars
1972-01-01	0.0498
1972-04-01	0.0350
1972-07-01	0.1014
1972-10-01	0.0156
1974-04-01	0.0172
1974-07-01	0.1051
1974-10-01	0.0250
1975-01-01	0.2094
1975-04-01	0.3556
1975-10-01	0.0375
1976-01-01	0.0931
1976-04-01	0.2828
1976-07-01	0.4003
1976-10-01	0.2800
1977-01-01	0.0680
1977-04-01	0.0860
1977-07-01	0.4835
1977-10-01	0.3561
1978-01-01	0.5844
1978-04-01	0.2500
1978-07-01	0.3708
1978-10-01	0.2613
1979-01-01	0.2682
1979-04-01	0.1108
1979-07-01	0.0130
1979-10-01	0.1537
1980-01-01	0.2250
1980-04-01	-0.1050
1980-07-01	0.1030
1980-10-01	0.0300
1981-01-01	0.0897
1981-04-01	0.0830
1981-07-01	0.0824
1981-10-01	0.4282
1982-01-01	0.0584
1982-04-01	0.1170
1982-07-01	0.8295
1982-10-01	0.3015
1983-01-01	0.1804
1983-04-01	-0.0348
1983-07-01	0.4462
1983-10-01	0.6550
1984-01-01	0.6503
1984-04-01	0.5422
1984-07-01	0.3149
1984-10-01	0.7959
1985-01-01	0.7941
1985-04-01	1.1571
1985-07-01	1.8996
1985-10-01	1.3349
1986-01-01	2.0859
1986-04-01	1.9918
1986-07-01	1.4327
1986-10-01	1.9545
1987-01-01	0.8959
1987-04-01	1.6054
1987-07-01	1.6138
1987-10-01	0.3336
1988-01-01	0.9726
1988-04-01	2.0353
1988-07-01	1.7239
1988-10-01	2.5733
1989-01-01	2.6863
1989-04-01	1.3744
1989-07-01	1.5406
1989-10-01	-0.3556
1990-01-01	0.3621
1990-04-01	0.6930
1990-07-01	0.1712
1990-10-01	-0.5312
1991-01-01	0.2358
1991-04-01	-0.1539
1991-07-01	0.3341
1991-10-01	-0.3118
1992-01-01	-0.2119
1992-04-01	-1.7478
1992-07-01	-1.5083
1992-10-01	-0.6613
1993-01-01	-1.5599
1993-04-01	-0.9262
1993-07-01	0.3826
1993-10-01	0.8725
1994-01-01	1.9803
1994-04-01	2.0935
1994-07-01	3.5361
1994-10-01	4.0327
1995-01-01	2.2641
1995-04-01	-1.1188
1995-07-01	2.2879
1995-10-01	2.5230
1996-01-01	1.6305
1996-04-01	2.5939
1996-07-01	2.9175
1996-10-01	4.3959
1997-01-01	2.8644
1997-04-01	3.0075
1997-07-01	-0.1004
1997-10-01	-1.6495
1998-01-01	0.8947
1998-04-01	3.2335
1998-07-01	-0.7572
1998-10-01	-2.3803
1999-01-01	1.3618
1999-04-01	0.1549
1999-07-01	4.5205
1999-10-01	0.9470
2000-01-01	4.2776
2000-04-01	7.3200
2000-07-01	0.5827
2000-10-01	-1.6591
2001-01-01	1.2779
2001-04-01	7.2333
2001-07-01	5.4847
2001-10-01	1.4313
2002-01-01	1.1912
2002-04-01	4.1060
2002-07-01	3.8467
2002-10-01	5.6999
2003-01-01	6.9486
2003-04-01	9.6540
2003-07-01	11.2415
2003-10-01	6.8889
2004-01-01	17.8206
2004-04-01	14.4931
2004-07-01	17.3024
2004-10-01	6.6645
2005-01-01	13.3499
2005-04-01	12.2074
2005-07-01	0.3521
2005-10-01	8.4622
2006-01-01	15.7922
2006-04-01	10.8443
2006-07-01	11.3342
2006-10-01	21.2933
2007-01-01	13.9348
2007-04-01	16.4458
2007-07-01	7.1577
2007-10-01	0.7533
2008-01-01	21.8152
2008-04-01	3.8563
2008-07-01	-2.3713
2008-10-01	1.1400
2009-01-01	-8.0326
2009-04-01	13.2051
2009-07-01	16.5860
2009-10-01	36.6093
2010-01-01	15.7216
2010-04-01	-3.3394
2010-07-01	16.4104
2010-10-01	5.3927
2011-01-01	1.3355
2011-04-01	7.4183
2011-07-01	1.3778
2011-10-01	-2.4170
2012-01-01	16.7675
2012-04-01	-1.6048
2012-07-01	26.2164
2012-10-01	-1.3046
2013-01-01	9.3129
2013-04-01	3.6342
2013-07-01	8.9492
2013-10-01	18.0980
2014-01-01	0.1503
2014-04-01	7.1871
2014-07-01	-0.6414
2014-10-01	4.5526
2015-01-01	7.9414
2015-04-01	11.1918