Quarter	Billions of US Dollars
1971-01-01	0.0456
1971-04-01	0.0306
1971-07-01	0.0306
1972-04-01	0.0315
1973-04-01	0.0143
1973-10-01	0.0100
1974-01-01	0.0517
1974-04-01	0.0625
1974-07-01	0.0103
1974-10-01	0.1628
1975-01-01	0.4205
1975-04-01	0.4652
1975-07-01	0.1662
1975-10-01	0.4410
1976-01-01	0.7695
1976-04-01	0.7286
1976-07-01	0.2054
1976-10-01	0.3717
1977-01-01	0.5577
1977-04-01	0.5655
1977-07-01	0.2701
1977-10-01	0.4368
1978-01-01	0.4729
1978-04-01	0.6600
1978-07-01	0.8147
1978-10-01	0.7947
1979-01-01	1.2774
1979-04-01	1.1065
1979-07-01	1.0008
1979-10-01	0.3471
1980-01-01	0.6497
1980-04-01	0.6592
1980-07-01	0.9865
1980-10-01	1.2984
1981-01-01	0.8025
1981-04-01	1.1167
1981-07-01	1.5712
1981-10-01	0.9707
1982-01-01	1.6746
1982-04-01	1.0551
1982-07-01	1.0481
1982-10-01	1.5666
1983-01-01	2.6525
1983-04-01	2.5469
1983-07-01	1.4838
1983-10-01	2.1872
1984-01-01	4.2171
1984-04-01	3.6499
1984-07-01	2.7958
1984-10-01	2.1418
1985-01-01	4.9309
1985-04-01	4.0166
1985-07-01	4.2298
1985-10-01	3.7206
1986-01-01	5.0207
1986-04-01	7.3623
1986-07-01	7.4821
1986-10-01	6.6817
1987-01-01	7.2571
1987-04-01	13.0531
1987-07-01	13.7940
1987-10-01	4.3627
1988-01-01	8.7679
1988-04-01	13.5278
1988-07-01	15.4490
1988-10-01	6.4348
1989-01-01	26.0936
1989-04-01	27.5975
1989-07-01	18.2225
1989-10-01	18.0142
1990-01-01	11.2297
1990-04-01	4.1268
1990-07-01	17.5963
1990-10-01	12.6668
1991-01-01	10.7136
1991-04-01	18.0919
1991-07-01	19.4634
1991-10-01	12.2642
1992-01-01	12.6492
1992-04-01	9.1105
1992-07-01	12.8529
1992-10-01	11.9120
1993-01-01	13.2388
1993-04-01	13.1766
1993-07-01	12.3818
1993-10-01	12.4005
1994-01-01	12.2918
1994-04-01	4.1891
1994-07-01	5.2836
1994-10-01	3.3497
1995-01-01	4.1818
1995-04-01	3.6711
1995-07-01	4.3118
1995-10-01	5.2207
1996-01-01	6.0281
1996-04-01	5.1461
1996-07-01	8.7039
1996-10-01	4.8330
1997-01-01	4.3303
1997-04-01	6.3525
1997-07-01	5.6612
1997-10-01	2.3041
1998-01-01	5.0041
1998-04-01	0.8230
1998-07-01	1.4508
1998-10-01	0.6877
1999-01-01	4.9852
1999-04-01	4.7724
1999-07-01	4.7601
1999-10-01	3.3594
2000-01-01	4.0815
2000-04-01	6.1964
2000-07-01	3.7297
2000-10-01	1.4149
2001-01-01	2.2565
2001-04-01	4.3159
2001-07-01	2.5915
2001-10-01	5.4247
2002-01-01	3.9310
2002-04-01	8.1459
2002-07-01	3.8269
2002-10-01	3.0303
2003-01-01	4.7153
2003-04-01	3.1547
2003-07-01	4.7190
2003-10-01	11.5644
2004-01-01	10.4000
2004-04-01	12.0020
2004-07-01	6.1929
2004-10-01	4.7236
2005-01-01	7.4995
2005-04-01	7.7393
2005-07-01	9.6731
2005-10-01	4.9127
2006-01-01	7.5929
2006-04-01	7.0314
2006-07-01	4.8489
2006-10-01	9.7312
2007-01-01	6.5597
2007-04-01	8.0638
2007-07-01	5.7533
2007-10-01	7.6267
2008-01-01	4.4002
2008-04-01	7.2376
2008-07-01	2.0775
2008-10-01	1.0318
2009-01-01	1.0212
2009-04-01	3.7158
2009-07-01	2.9033
2009-10-01	8.1875
2010-01-01	9.1033
2010-04-01	4.9168
2010-07-01	10.7390
2010-10-01	1.8428
2011-01-01	12.2219
2011-04-01	4.2473
2011-07-01	8.4516
2011-10-01	5.3304
2012-01-01	14.6655
2012-04-01	3.6791
2012-07-01	15.3844
2012-10-01	9.7373
2013-01-01	15.8195
2013-04-01	8.6215
2013-07-01	23.9995
2013-10-01	9.7730
2014-01-01	16.5346
2014-04-01	16.5744
2014-07-01	20.2524
2014-10-01	11.5929
2015-01-01	20.9027
2015-04-01	9.8397