Quarter	Billions of US Dollars
1972-01-01	0.0498
1972-04-01	0.0682
1972-07-01	0.0682
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
1975-07-01	0.0375
1975-10-01	0.0150
1976-01-01	0.0781
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	0.4935
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	0.2982
1979-04-01	0.1400
1979-07-01	0.0130
1979-10-01	0.1537
1980-01-01	0.2250
1980-07-01	0.2156
1980-10-01	0.0300
1981-01-01	0.1197
1981-04-01	0.1199
1981-07-01	0.0824
1981-10-01	0.5345
1982-01-01	0.5087
1982-04-01	0.2209
1982-07-01	1.0230
1982-10-01	0.4480
1983-01-01	0.1381
1983-04-01	0.2786
1983-07-01	0.5493
1983-10-01	1.0781
1984-01-01	0.5503
1984-04-01	0.6197
1984-07-01	0.5564
1984-10-01	0.9770
1985-01-01	0.9253
1985-04-01	1.8558
1985-07-01	1.6495
1985-10-01	1.6410
1986-01-01	3.0111
1986-04-01	2.3366
1986-07-01	2.0587
1986-10-01	2.3160
1987-01-01	1.9360
1987-04-01	1.8453
1987-07-01	1.3054
1987-10-01	0.5911
1988-01-01	1.6114
1988-04-01	3.2080
1988-07-01	2.2074
1988-10-01	2.4117
1989-01-01	3.2708
1989-04-01	2.7891
1989-07-01	1.3748
1989-10-01	1.0997
1990-01-01	1.4193
1990-04-01	1.4589
1990-07-01	1.9994
1990-10-01	0.9317
1991-01-01	2.1709
1991-04-01	2.2727
1991-07-01	1.4563
1991-10-01	1.2503
1992-01-01	2.3211
1992-04-01	0.6932
1992-07-01	1.7380
1992-10-01	0.1704
1993-01-01	1.3509
1993-04-01	1.2822
1993-07-01	2.2632
1993-10-01	3.0877
1994-01-01	4.6286
1994-04-01	3.9875
1994-07-01	6.0661
1994-10-01	5.2471
1995-01-01	3.4542
1995-04-01	1.6064
1995-07-01	5.6559
1995-10-01	4.4399
1996-01-01	4.8392
1996-04-01	7.1548
1996-07-01	6.4314
1996-10-01	6.2935
1997-01-01	6.8631
1997-04-01	4.9688
1997-07-01	4.4536
1997-10-01	4.2425
1998-01-01	4.8567
1998-04-01	6.7434
1998-07-01	3.5397
1998-10-01	2.8649
1999-01-01	5.4674
1999-04-01	5.0497
1999-07-01	7.9064
1999-10-01	4.5738
2000-01-01	8.0938
2000-04-01	9.9368
2000-07-01	4.4727
2000-10-01	2.6550
2001-01-01	5.4361
2001-04-01	11.0451
2001-07-01	8.0843
2001-10-01	6.4386
2002-01-01	7.1061
2002-04-01	7.5801
2002-07-01	9.0854
2002-10-01	11.4566
2003-01-01	15.3115
2003-04-01	17.1379
2003-07-01	19.3121
2003-10-01	15.3331
2004-01-01	24.6168
2004-04-01	20.7767
2004-07-01	25.8831
2004-10-01	15.2178
2005-01-01	22.7703
2005-04-01	20.5906
2005-07-01	13.6127
2005-10-01	15.8350
2006-01-01	28.5035
2006-04-01	21.3323
2006-07-01	26.6470
2006-10-01	30.1045
2007-01-01	31.5624
2007-04-01	31.8854
2007-07-01	16.9700
2007-10-01	18.7820
2008-01-01	39.4358
2008-04-01	27.4559
2008-07-01	17.2819
2008-10-01	15.0910
2009-01-01	25.5932
2009-04-01	26.6225
2009-07-01	32.5929
2009-10-01	52.8357
2010-01-01	33.4736
2010-04-01	11.4959
2010-07-01	26.8799
2010-10-01	29.0559
2011-01-01	28.0873
2011-04-01	31.9223
2011-07-01	14.9138
2011-10-01	15.2016
2012-01-01	38.9772
2012-04-01	18.6765
2012-07-01	42.3232
2012-10-01	18.9341
2013-01-01	26.3547
2013-04-01	21.0785
2013-07-01	26.8896
2013-10-01	30.6598
2014-01-01	25.9988
2014-04-01	26.1979
2014-07-01	26.1136
2014-10-01	22.0956
2015-01-01	32.6518
2015-04-01	22.1371