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	0.4861
1986-07-01	0.4986
1986-10-01	0.6486
1987-01-01	0.7068
1987-04-01	0.7809
1987-07-01	0.7810
1987-10-01	0.8727
1988-01-01	0.8691
1988-04-01	0.8615
1988-07-01	0.8588
1988-10-01	0.7862
1989-01-01	0.7594
1989-04-01	0.7592
1989-07-01	0.6914
1989-10-01	0.4920
1990-01-01	0.5600
1990-04-01	0.5600
1990-07-01	0.5600
1990-10-01	0.5600
1991-01-01	0.5935
1991-04-01	0.6140
1991-07-01	0.6655
1991-10-01	0.6668
1992-01-01	0.7051
1992-04-01	0.6561
1992-07-01	0.6567
1992-10-01	0.5805
1993-01-01	0.5806
1993-04-01	0.5810
1993-07-01	0.5818
1993-10-01	0.8063
1994-01-01	1.0072
1994-04-01	1.1086
1994-07-01	1.1618
1994-10-01	1.2137
1995-01-01	1.1423
1995-04-01	1.1744
1995-07-01	1.2122
1995-10-01	1.2422
1996-01-01	1.1695
1996-04-01	1.6431
1996-07-01	1.6580
1996-10-01	2.7653
1997-01-01	3.2291
1997-04-01	3.9865
1997-07-01	4.8270
1997-10-01	4.7988
1998-01-01	4.7839
1998-04-01	7.0735
1998-07-01	7.1598
1998-10-01	7.2375
1999-01-01	8.1608
1999-04-01	7.9768
1999-07-01	9.0058
1999-10-01	10.0478
2000-01-01	10.4085
2000-04-01	13.4906
2000-07-01	13.9138
2000-10-01	14.4121
2001-01-01	15.8147
2001-04-01	15.7626
2001-07-01	18.1073
2001-10-01	20.8537
2002-01-01	21.0163
2002-04-01	19.8639
2002-07-01	19.6168
2002-10-01	19.9330
2003-01-01	20.2834
2003-04-01	21.5308
2003-07-01	22.9928
2003-10-01	26.6090
2004-01-01	27.6328
2004-04-01	29.5911
2004-07-01	30.5572
2004-10-01	33.8513
2005-01-01	34.1412
2005-04-01	34.4145
2005-07-01	36.0554
2005-10-01	36.6801
2006-01-01	36.9337
2006-04-01	40.2893
2006-07-01	41.5884
2006-10-01	42.1653
2007-01-01	41.7468
2007-04-01	44.8140
2007-07-01	45.8286
2007-10-01	47.0247
2008-01-01	48.2358
2008-04-01	49.1450
2008-07-01	50.1172
2008-10-01	48.7292
2009-01-01	46.3038
2009-04-01	44.3525
2009-07-01	46.0967
2009-10-01	48.6326
2010-01-01	49.2898
2010-04-01	47.9557
2010-07-01	52.3429
2010-10-01	53.0057
2011-01-01	54.8411
2011-04-01	56.3898
2011-07-01	53.1369
2011-10-01	53.0607
2012-01-01	60.0735
2012-04-01	58.4019
2012-07-01	67.3827
2012-10-01	72.2494
2013-01-01	74.6167
2013-04-01	75.1278
2013-07-01	76.3937
2013-10-01	75.0820
2014-01-01	76.7287
2014-04-01	79.5988
2014-07-01	81.9954
2014-10-01	76.6764
2015-01-01	75.7497
2015-04-01	78.0034