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
1973-07-01	0.0413
1973-10-01	0.0350
1974-01-01	0.0517
1974-04-01	0.0725
1974-07-01	0.0103
1974-10-01	0.1828
1975-01-01	0.4205
1975-04-01	0.4652
1975-07-01	0.1849
1975-10-01	0.4560
1976-01-01	0.7656
1976-04-01	0.7286
1976-07-01	0.2204
1976-10-01	0.3717
1977-01-01	0.6027
1977-04-01	0.5655
1977-07-01	0.3401
1977-10-01	0.4568
1978-01-01	0.4929
1978-04-01	0.6322
1978-07-01	0.8147
1978-10-01	0.8113
1979-01-01	1.3043
1979-04-01	1.2315
1979-07-01	1.0008
1979-10-01	0.4721
1980-01-01	0.6527
1980-04-01	0.6592
1980-07-01	1.1115
1980-10-01	1.3484
1981-01-01	0.8720
1981-04-01	1.1467
1981-07-01	1.6753
1981-10-01	1.1207
1982-01-01	1.7246
1982-04-01	1.1270
1982-07-01	1.4031
1982-10-01	1.6571
1983-01-01	3.1097
1983-04-01	3.1574
1983-07-01	2.0034
1983-10-01	3.0060
1984-01-01	5.0050
1984-04-01	4.5414
1984-07-01	3.1730
1984-10-01	2.9844
1985-01-01	5.6033
1985-04-01	5.0642
1985-07-01	4.6875
1985-10-01	4.5765
1986-01-01	5.6917
1986-04-01	8.6803
1986-07-01	8.3482
1986-10-01	8.1329
1987-01-01	8.8864
1987-04-01	13.6685
1987-07-01	14.6211
1987-10-01	4.9716
1988-01-01	9.3349
1988-04-01	15.0803
1988-07-01	17.1688
1988-10-01	8.1376
1989-01-01	28.2614
1989-04-01	29.2110
1989-07-01	19.3665
1989-10-01	20.0937
1990-01-01	14.1778
1990-04-01	5.3001
1990-07-01	23.2043
1990-10-01	15.2318
1991-01-01	16.0274
1991-04-01	20.0555
1991-07-01	20.3465
1991-10-01	14.2822
1992-01-01	15.4910
1992-04-01	10.4981
1992-07-01	17.8836
1992-10-01	12.5206
1993-01-01	15.1965
1993-04-01	13.6004
1993-07-01	16.7804
1993-10-01	17.1411
1994-01-01	16.0983
1994-04-01	11.0473
1994-07-01	14.6377
1994-10-01	10.1626
1995-01-01	12.0225
1995-04-01	13.4830
1995-07-01	18.7436
1995-10-01	14.4924
1996-01-01	20.3763
1996-04-01	16.0861
1996-07-01	22.9488
1996-10-01	18.3664
1997-01-01	20.7761
1997-04-01	18.2830
1997-07-01	26.2233
1997-10-01	11.8833
1998-01-01	16.8665
1998-04-01	9.9413
1998-07-01	8.0521
1998-10-01	8.8275
1999-01-01	14.2082
1999-04-01	13.4211
1999-07-01	17.4781
1999-10-01	10.4638
2000-01-01	9.7453
2000-04-01	14.8674
2000-07-01	13.1312
2000-10-01	6.2319
2001-01-01	7.2298
2001-04-01	13.9639
2001-07-01	8.9089
2001-10-01	12.8288
2002-01-01	8.8718
2002-04-01	12.2527
2002-07-01	10.6761
2002-10-01	8.3277
2003-01-01	11.8576
2003-04-01	8.1387
2003-07-01	9.2270
2003-10-01	17.4816
2004-01-01	18.8266
2004-04-01	18.6325
2004-07-01	12.0228
2004-10-01	9.7660
2005-01-01	12.8776
2005-04-01	12.3192
2005-07-01	15.0858
2005-10-01	9.7661
2006-01-01	23.8059
2006-04-01	16.1815
2006-07-01	15.1537
2006-10-01	23.9765
2007-01-01	19.8728
2007-04-01	16.3777
2007-07-01	17.8267
2007-10-01	15.9834
2008-01-01	11.9443
2008-04-01	14.6803
2008-07-01	12.5261
2008-10-01	10.4765
2009-01-01	9.6246
2009-04-01	7.8548
2009-07-01	13.2903
2009-10-01	14.7979
2010-01-01	12.2365
2010-04-01	8.0776
2010-07-01	15.8375
2010-10-01	7.2567
2011-01-01	16.4727
2011-04-01	8.2614
2011-07-01	12.3960
2011-10-01	8.1361
2012-01-01	19.4744
2012-04-01	7.0478
2012-07-01	23.4844
2012-10-01	12.2922
2013-01-01	21.9341
2013-04-01	13.6914
2013-07-01	30.8767
2013-10-01	17.2820
2014-01-01	23.0206
2014-04-01	18.2337
2014-07-01	26.7319
2014-10-01	18.2708
2015-01-01	26.5643
2015-04-01	16.1792