Quarter	Billions of US Dollars
1971-10-01	0.0150
1972-01-01	0.0200
1972-04-01	0.0515
1972-10-01	0.0200
1973-07-01	0.0766
1973-10-01	0.0300
1974-01-01	0.0500
1974-07-01	0.0090
1975-01-01	0.0244
1975-04-01	0.0120
1975-10-01	0.0192
1976-04-01	0.0250
1976-07-01	0.0600
1976-10-01	0.0848
1977-01-01	0.0619
1977-04-01	0.1089
1977-07-01	0.0768
1977-10-01	0.0622
1978-01-01	0.1161
1978-07-01	0.0223
1978-10-01	0.0420
1979-01-01	0.1057
1980-04-01	-0.0200
1980-07-01	0.0250
1981-01-01	0.0750
1981-07-01	-0.0300
1981-10-01	0.0300
1982-01-01	-0.0141
1982-04-01	-0.0041
1982-07-01	0.0566
1982-10-01	0.0200
1983-01-01	-0.0757
1983-04-01	-0.0250
1983-07-01	0.0379
1983-10-01	0.1080
1984-01-01	0.0800
1984-07-01	-0.0278
1984-10-01	0.0750
1985-01-01	0.0590
1985-04-01	0.1069
1985-07-01	-0.0500
1985-10-01	0.0104
1986-01-01	-0.1059
1986-04-01	-0.0360
1986-07-01	0.1203
1986-10-01	0.1691
1987-01-01	0.0475
1987-04-01	0.3738
1987-07-01	-0.0265
1987-10-01	0.0730
1988-01-01	0.0638
1988-04-01	0.0462
1988-07-01	-0.0781
1988-10-01	0.0030
1989-01-01	-0.0252
1989-04-01	0.1284
1989-07-01	-0.0681
1989-10-01	-0.2500
1990-01-01	0.0341
1990-04-01	0.0705
1990-07-01	-0.0245
1990-10-01	-0.0182
1991-01-01	-0.0319
1991-04-01	0.3810
1991-07-01	0.1737
1991-10-01	-0.0850
1992-01-01	0.0390
1992-04-01	-0.1185
1992-07-01	-0.0074
1992-10-01	-0.0733
1993-01-01	-0.0396
1993-04-01	0.1589
1993-07-01	1.3017
1993-10-01	2.8422
1994-01-01	2.0259
1994-04-01	0.8506
1994-07-01	0.9041
1994-10-01	2.2512
1995-01-01	-0.0785
1995-04-01	-0.0767
1995-07-01	0.6930
1995-10-01	1.2539
1996-01-01	2.3789
1996-04-01	0.1897
1996-07-01	4.7515
1996-10-01	2.9431
1997-01-01	3.3183
1997-04-01	3.8105
1997-07-01	6.5942
1997-10-01	0.8586
1998-01-01	0.9525
1998-04-01	4.3376
1998-07-01	1.5446
1998-10-01	-0.6907
1999-01-01	6.6652
1999-04-01	1.6873
1999-07-01	1.9848
1999-10-01	2.5581
2000-01-01	2.8643
2000-04-01	5.7698
2000-07-01	5.8888
2000-10-01	4.3084
2001-01-01	8.9622
2001-04-01	7.5502
2001-07-01	5.3329
2001-10-01	5.6207
2002-01-01	2.9161
2002-04-01	0.2071
2002-07-01	-0.6554
2002-10-01	3.8236
2003-01-01	1.6837
2003-04-01	2.7347
2003-07-01	2.4138
2003-10-01	8.1038
2004-01-01	-0.2039
2004-04-01	4.3941
2004-07-01	2.9604
2004-10-01	7.5022
2005-01-01	2.9636
2005-04-01	8.2804
2005-07-01	6.8774
2005-10-01	5.5863
2006-01-01	3.5171
2006-04-01	10.1401
2006-07-01	4.2544
2006-10-01	6.6394
2007-01-01	1.4446
2007-04-01	11.5215
2007-07-01	3.5650
2007-10-01	0.9831
2008-01-01	10.0563
2008-04-01	-1.3298
2008-07-01	2.9668
2008-10-01	-3.4898
2009-01-01	1.2912
2009-04-01	11.4526
2009-07-01	4.4535
2009-10-01	4.9246
2010-01-01	4.4943
2010-04-01	-1.7551
2010-07-01	5.7341
2010-10-01	2.2770
2011-01-01	-8.9393
2011-04-01	3.7316
2011-07-01	-1.6900
2011-10-01	5.2923
2012-01-01	16.9966
2012-04-01	9.9097
2012-07-01	13.3994
2012-10-01	14.3223
2013-01-01	6.6210
2013-04-01	5.9267
2013-07-01	1.5677
2013-10-01	-2.8015
2014-01-01	4.0255
2014-04-01	1.1604
2014-07-01	10.0286
2014-10-01	0.7581
2015-01-01	11.5947
2015-04-01	5.8089