Quarter	Billions of US Dollars
1975-07-01	0.0188
1975-10-01	0.0191
1976-01-01	0.0476
1976-04-01	0.0468
1976-07-01	0.0497
1976-10-01	0.0517
1977-01-01	0.0510
1977-04-01	0.0517
1977-07-01	0.0747
1977-10-01	0.0791
1978-01-01	0.0819
1978-04-01	0.0802
1978-07-01	0.0839
1978-10-01	0.0879
1979-01-01	0.0865
1979-04-01	0.0865
1979-07-01	0.0900
1979-10-01	0.0907
1980-01-01	0.0835
1980-04-01	0.0898
1980-07-01	0.0979
1980-10-01	0.0928
1981-01-01	0.0881
1981-04-01	0.0812
1981-07-01	0.0827
1981-10-01	0.0847
1982-01-01	0.0808
1982-04-01	0.0800
1982-07-01	0.0640
1982-10-01	0.0667
1983-01-01	0.0583
1983-04-01	0.0564
1983-07-01	0.0550
1983-10-01	0.0538
1984-01-01	0.0557
1984-04-01	0.0530
1984-07-01	0.0752
1984-10-01	0.0739
1985-01-01	0.0744
1985-04-01	0.0748
1985-07-01	0.0608
1985-10-01	0.1030
1986-01-01	0.3431
1986-04-01	0.3513
1986-07-01	0.3653
1986-10-01	0.5224
1987-01-01	0.5360
1987-04-01	0.6054
1987-07-01	0.5873
1987-10-01	0.6186
1988-01-01	0.6098
1988-04-01	0.5966
1988-07-01	0.5895
1988-10-01	0.6071
1989-01-01	0.6319
1989-04-01	0.5942
1989-07-01	0.6032
1989-10-01	0.6210
1990-01-01	0.6175
1990-04-01	0.5445
1990-07-01	0.8915
1990-10-01	0.7614
1991-01-01	0.6968
1991-04-01	0.6649
1991-07-01	0.6809
1991-10-01	0.7220
1992-01-01	0.6805
1992-04-01	0.7261
1992-07-01	0.9194
1992-10-01	0.8383
1993-01-01	0.8365
1993-04-01	0.6294
1993-07-01	0.7473
1993-10-01	0.7300
1994-01-01	0.7359
1994-04-01	0.7561
1994-07-01	0.7697
1994-10-01	1.7688
1995-01-01	1.9186
1995-04-01	1.9856
1995-07-01	1.8127
1995-10-01	1.3800
1996-01-01	1.5801
1996-04-01	1.8720
1996-07-01	2.0143
1996-10-01	2.1096
1997-01-01	2.8640
1997-04-01	3.4298
1997-07-01	3.5010
1997-10-01	3.9616
1998-01-01	4.6261
1998-04-01	4.1905
1998-07-01	5.4988
1998-10-01	6.2816
1999-01-01	6.9471
1999-04-01	6.7773
1999-07-01	7.8157
1999-10-01	6.2492
2000-01-01	5.8406
2000-04-01	6.3149
2000-07-01	6.7801
2000-10-01	9.4181
2001-01-01	9.2596
2001-04-01	9.2526
2001-07-01	6.9532
2001-10-01	6.0488
2002-01-01	5.8533
2002-04-01	6.6060
2002-07-01	6.0834
2002-10-01	6.4009
2003-01-01	6.5531
2003-04-01	6.5217
2003-07-01	6.5549
2003-10-01	7.2446
2004-01-01	7.3786
2004-04-01	8.2575
2004-07-01	7.9962
2004-10-01	8.7337
2005-01-01	8.4615
2005-04-01	7.9235
2005-07-01	7.6784
2005-10-01	9.2916
2006-01-01	9.3793
2006-04-01	11.1613
2006-07-01	12.0520
2006-10-01	12.5457
2007-01-01	12.7287
2007-04-01	14.8924
2007-07-01	15.1019
2007-10-01	15.5530
2008-01-01	16.1820
2008-04-01	18.6498
2008-07-01	17.6336
2008-10-01	17.0545
2009-01-01	15.4886
2009-04-01	16.7395
2009-07-01	17.5876
2009-10-01	18.4404
2010-01-01	17.7481
2010-04-01	17.9691
2010-07-01	19.3242
2010-10-01	20.7203
2011-01-01	21.8116
2011-04-01	21.7293
2011-07-01	21.3725
2011-10-01	21.9002
2012-01-01	24.3844
2012-04-01	24.6347
2012-07-01	25.9586
2012-10-01	26.6413
2013-01-01	27.6812
2013-04-01	25.7195
2013-07-01	31.0168
2013-10-01	37.1207
2014-01-01	36.5941
2014-04-01	45.1383
2014-07-01	46.6649
2014-10-01	51.3490
2015-01-01	49.2569
2015-04-01	53.1124