Quarter	Billions of US Dollars
1972-04-01	0.0317
1972-07-01	0.0312
1972-10-01	0.0512
1973-01-01	0.0552
1973-04-01	0.0612
1973-07-01	0.0614
1973-10-01	0.0870
1974-01-01	0.0896
1974-04-01	0.0891
1974-07-01	0.0877
1974-10-01	0.0915
1975-01-01	0.0926
1975-04-01	0.1045
1975-07-01	0.0996
1975-10-01	0.1192
1976-01-01	0.1211
1976-04-01	0.1453
1976-07-01	0.2086
1976-10-01	0.2816
1977-01-01	0.3444
1977-04-01	0.3486
1977-07-01	0.3831
1977-10-01	0.4644
1978-01-01	0.5055
1978-04-01	0.5123
1978-07-01	0.5402
1978-10-01	0.5417
1979-01-01	0.5526
1979-04-01	0.5506
1979-07-01	0.5590
1979-10-01	0.5515
1980-01-01	0.5243
1980-04-01	0.5586
1980-07-01	0.5563
1980-10-01	0.5480
1981-01-01	0.6058
1981-04-01	0.5811
1981-07-01	0.5522
1981-10-01	0.5408
1982-01-01	0.5179
1982-04-01	0.5068
1982-07-01	0.5572
1982-10-01	0.5555
1983-01-01	0.4854
1983-04-01	0.4601
1983-07-01	0.4614
1983-10-01	0.5206
1984-01-01	0.5245
1984-04-01	0.5167
1984-07-01	0.4968
1984-10-01	0.4939
1985-01-01	0.4971
1985-04-01	0.4740
1985-07-01	0.4927
1985-10-01	0.5447
1986-01-01	0.4734
1986-04-01	0.5200
1986-07-01	0.5299
1986-10-01	0.6819
1987-01-01	0.7421
1987-04-01	0.8457
1987-07-01	0.8457
1987-10-01	0.9378
1988-01-01	0.9356
1988-04-01	1.0155
1988-07-01	1.1643
1988-10-01	1.2956
1989-01-01	1.3536
1989-04-01	1.5179
1989-07-01	1.9946
1989-10-01	1.8308
1990-01-01	1.9369
1990-04-01	1.8590
1990-07-01	1.8896
1990-10-01	1.8179
1991-01-01	1.7801
1991-04-01	1.7280
1991-07-01	1.6904
1991-10-01	1.6167
1992-01-01	1.5205
1992-04-01	1.4387
1992-07-01	1.4237
1992-10-01	1.3299
1993-01-01	1.2401
1993-04-01	1.1952
1993-07-01	1.6752
1993-10-01	1.6753
1994-01-01	1.6884
1994-04-01	1.6728
1994-07-01	1.4413
1994-10-01	1.5411
1995-01-01	1.5302
1995-04-01	1.5379
1995-07-01	1.5596
1995-10-01	1.5847
1996-01-01	1.5899
1996-04-01	2.0900
1996-07-01	1.8753
1996-10-01	2.0830
1997-01-01	2.1565
1997-04-01	2.4505
1997-07-01	3.3701
1997-10-01	3.3312
1998-01-01	3.3154
1998-04-01	4.7428
1998-07-01	4.8364
1998-10-01	4.8944
1999-01-01	5.8221
1999-04-01	5.8814
1999-07-01	6.6311
1999-10-01	6.9466
2000-01-01	6.9594
2000-04-01	8.5806
2000-07-01	8.8332
2000-10-01	8.8058
2001-01-01	8.5008
2001-04-01	9.3721
2001-07-01	11.5698
2001-10-01	15.3139
2002-01-01	15.7261
2002-04-01	15.7380
2002-07-01	15.5385
2002-10-01	16.0300
2003-01-01	16.5607
2003-04-01	17.3674
2003-07-01	18.8461
2003-10-01	22.5463
2004-01-01	22.8820
2004-04-01	24.9651
2004-07-01	27.3333
2004-10-01	30.7507
2005-01-01	31.4676
2005-04-01	32.0126
2005-07-01	34.1843
2005-10-01	35.9111
2006-01-01	36.3264
2006-04-01	40.1580
2006-07-01	41.2292
2006-10-01	42.8607
2007-01-01	45.4673
2007-04-01	49.4803
2007-07-01	50.5038
2007-10-01	51.5898
2008-01-01	52.3545
2008-04-01	52.3264
2008-07-01	51.9883
2008-10-01	50.3697
2009-01-01	47.1309
2009-04-01	45.1456
2009-07-01	46.6354
2009-10-01	48.6944
2010-01-01	48.4297
2010-04-01	48.4454
2010-07-01	52.0249
2010-10-01	52.4219
2011-01-01	55.3802
2011-04-01	56.8856
2011-07-01	53.8060
2011-10-01	53.1313
2012-01-01	62.8321
2012-04-01	62.0082
2012-07-01	71.0117
2012-10-01	75.9163
2013-01-01	78.1070
2013-04-01	79.2798
2013-07-01	79.6986
2013-10-01	79.5820
2014-01-01	82.1750
2014-04-01	85.2375
2014-07-01	92.3054
2014-10-01	88.8224
2015-01-01	89.6504
2015-04-01	94.4539