Quarter	Billions of US Dollars
1971-01-01	0.0150
1971-10-01	0.0484
1972-01-01	0.0786
1972-04-01	0.0315
1972-07-01	0.1204
1972-10-01	0.0662
1973-01-01	0.0630
1973-04-01	0.0131
1973-07-01	0.0693
1974-01-01	0.0313
1974-04-01	0.0017
1974-10-01	0.0597
1975-01-01	0.1465
1975-04-01	0.0279
1975-07-01	0.1546
1975-10-01	0.0872
1976-01-01	0.0672
1976-04-01	0.0347
1976-07-01	0.0654
1976-10-01	0.1808
1977-01-01	0.0576
1977-04-01	0.0802
1977-07-01	0.0732
1977-10-01	0.1859
1978-01-01	0.3265
1978-04-01	0.2963
1978-07-01	0.1531
1978-10-01	0.2421
1979-01-01	0.3009
1979-04-01	0.1383
1979-07-01	0.0294
1979-10-01	0.1635
1980-01-01	-0.0063
1980-04-01	0.0705
1980-07-01	-0.0244
1980-10-01	-0.0081
1981-01-01	0.0136
1981-04-01	0.2593
1981-07-01	0.0250
1981-10-01	0.2048
1982-01-01	0.0946
1982-04-01	0.1497
1982-07-01	0.1845
1982-10-01	0.1457
1983-01-01	0.1241
1983-04-01	0.2150
1983-07-01	0.1176
1983-10-01	-0.0264
1984-01-01	0.1970
1984-04-01	0.2682
1984-07-01	0.1899
1984-10-01	0.1296
1985-01-01	0.2795
1985-04-01	0.1305
1985-07-01	0.0312
1985-10-01	-0.1452
1986-01-01	0.3765
1986-04-01	0.4533
1986-07-01	0.4217
1986-10-01	0.1606
1987-01-01	0.6595
1987-04-01	0.2777
1987-07-01	-0.1222
1987-10-01	0.6587
1988-01-01	0.5868
1988-04-01	1.1845
1988-07-01	0.1014
1988-10-01	0.5638
1989-01-01	0.8816
1989-04-01	0.5923
1989-07-01	0.3514
1989-10-01	0.3322
1990-01-01	0.6893
1990-04-01	1.0046
1990-07-01	1.2426
1990-10-01	1.9062
1991-01-01	1.1167
1991-04-01	0.7200
1991-07-01	1.1574
1991-10-01	1.5687
1992-01-01	1.5402
1992-04-01	3.8740
1992-07-01	2.2584
1992-10-01	3.2494
1993-01-01	2.8702
1993-04-01	1.0479
1993-07-01	-0.7965
1993-10-01	-0.6677
1994-01-01	1.1442
1994-04-01	2.1122
1994-07-01	3.5946
1994-10-01	0.2381
1995-01-01	0.6266
1995-04-01	-0.6303
1995-07-01	-0.8454
1995-10-01	-0.9554
1996-01-01	1.9204
1996-04-01	-0.6374
1996-07-01	-0.4886
1996-10-01	0.6226
1997-01-01	1.3902
1997-04-01	-0.4573
1997-07-01	-1.1533
1997-10-01	-2.4849
1998-01-01	-1.9893
1998-04-01	0.7791
1998-07-01	-0.0632
1998-10-01	-2.1144
1999-01-01	-0.8918
1999-04-01	0.0645
1999-07-01	0.9307
1999-10-01	0.0336
2000-01-01	-1.7264
2000-04-01	0.9784
2000-07-01	-0.1624
2000-10-01	-1.2364
2001-01-01	-0.4970
2001-04-01	5.2476
2001-07-01	-1.2369
2001-10-01	0.1846
2002-01-01	1.3948
2002-04-01	-0.8683
2002-07-01	-1.3094
2002-10-01	0.6511
2003-01-01	7.0291
2003-04-01	4.2263
2003-07-01	1.6650
2003-10-01	-1.3725
2004-01-01	2.7215
2004-04-01	1.7920
2004-07-01	-1.8845
2004-10-01	1.2308
2005-01-01	1.3282
2005-04-01	0.0194
2005-07-01	-0.0470
2005-10-01	0.9706
2006-01-01	1.5276
2006-04-01	3.3498
2006-07-01	-7.6158
2006-10-01	0.6615
2007-01-01	-2.9485
2007-04-01	1.3650
2007-07-01	-6.6740
2007-10-01	-1.9164
2008-01-01	-1.6720
2008-04-01	0.3556
2008-07-01	-4.7828
2008-10-01	-0.5885
2009-01-01	4.4164
2009-04-01	1.7554
2009-07-01	2.2730
2009-10-01	1.7703
2010-01-01	4.3023
2010-04-01	0.2080
2010-07-01	2.0276
2010-10-01	3.1858
2011-01-01	14.0165
2011-04-01	0.9250
2011-07-01	0.1554
2011-10-01	0.7009
2012-01-01	7.7850
2012-04-01	6.7202
2012-07-01	-0.3469
2012-10-01	4.8044
2013-01-01	3.8559
2013-04-01	4.2822
2013-07-01	4.4974
2013-10-01	4.4752
2014-01-01	2.7359
2014-04-01	7.7414
2014-07-01	4.7670
2014-10-01	0.1928
2015-01-01	2.1361
2015-04-01	6.9258