Quarter	Billions of US Dollars
1967-04-01	0.020
1967-07-01	0.020
1967-10-01	0.020
1968-01-01	0.020
1968-04-01	0.020
1968-07-01	0.020
1968-10-01	0.020
1969-01-01	0.020
1969-04-01	0.020
1969-07-01	0.020
1969-10-01	0.020
1970-01-01	0.020
1970-04-01	0.020
1970-07-01	0.020
1970-10-01	0.020
1971-01-01	0.048
1971-04-01	0.049
1971-07-01	0.050
1971-10-01	0.096
1972-01-01	0.130
1972-04-01	0.130
1972-07-01	0.160
1972-10-01	0.226
1973-01-01	0.277
1973-04-01	0.324
1973-07-01	0.325
1973-10-01	0.303
1974-01-01	0.316
1974-04-01	0.313
1974-07-01	0.331
1974-10-01	0.350
1975-01-01	0.377
1975-04-01	0.394
1975-07-01	0.393
1975-10-01	0.396
1976-01-01	0.412
1976-04-01	0.477
1976-07-01	0.519
1976-10-01	0.671
1977-01-01	0.827
1977-04-01	1.026
1977-07-01	1.071
1977-10-01	1.230
1978-01-01	1.275
1978-04-01	1.499
1978-07-01	1.642
1978-10-01	1.662
1979-01-01	1.828
1979-04-01	1.977
1979-07-01	2.122
1979-10-01	2.146
1980-01-01	2.051
1980-04-01	2.379
1980-07-01	2.399
1980-10-01	2.358
1981-01-01	2.218
1981-04-01	2.210
1981-07-01	2.244
1981-10-01	2.413
1982-01-01	2.525
1982-04-01	2.674
1982-07-01	2.613
1982-10-01	2.794
1983-01-01	2.958
1983-04-01	3.035
1983-07-01	3.147
1983-10-01	3.445
1984-01-01	4.004
1984-04-01	3.610
1984-07-01	3.524
1984-10-01	4.115
1985-01-01	4.605
1985-04-01	5.016
1985-07-01	5.454
1985-10-01	5.468
1986-01-01	5.404
1986-04-01	5.586
1986-07-01	5.821
1986-10-01	5.464
1987-01-01	5.457
1987-04-01	4.912
1987-07-01	5.179
1987-10-01	6.056
1988-01-01	6.048
1988-04-01	5.531
1988-07-01	5.453
1988-10-01	5.906
1989-01-01	5.763
1989-04-01	5.705
1989-07-01	5.736
1989-10-01	5.774
1990-01-01	5.630
1990-04-01	6.224
1990-07-01	6.992
1990-10-01	8.073
1991-01-01	7.450
1991-04-01	7.598
1991-07-01	7.840
1991-10-01	9.568
1992-01-01	9.893
1992-04-01	12.056
1992-07-01	14.345
1992-10-01	13.646
1993-01-01	16.134
1993-04-01	16.948
1993-07-01	17.371
1993-10-01	16.874
1994-01-01	17.104
1994-04-01	17.672
1994-07-01	19.578
1994-10-01	19.375
1995-01-01	24.946
1995-04-01	24.940
1995-07-01	23.640
1995-10-01	23.102
1996-01-01	22.650
1996-04-01	22.031
1996-07-01	24.559
1996-10-01	24.799
1997-01-01	24.740
1997-04-01	25.599
1997-07-01	26.741
1997-10-01	27.137
1998-01-01	27.671
1998-04-01	29.384
1998-07-01	32.786
1998-10-01	34.615
1999-01-01	33.857
1999-04-01	36.700
1999-07-01	39.760
1999-10-01	41.713
2000-01-01	39.702
2000-04-01	41.947
2000-07-01	42.186
2000-10-01	44.145
2001-01-01	43.056
2001-04-01	46.474
2001-07-01	50.262
2001-10-01	52.761
2002-01-01	58.300
2002-04-01	68.455
2002-07-01	70.772
2002-10-01	82.487
2003-01-01	95.382
2003-04-01	115.986
2003-07-01	126.139
2003-10-01	152.423
2004-01-01	160.723
2004-04-01	171.108
2004-07-01	175.488
2004-10-01	209.828
2005-01-01	218.546
2005-04-01	239.274
2005-07-01	246.286
2005-10-01	289.911
2006-01-01	358.606
2006-04-01	423.080
2006-07-01	444.423
2006-10-01	491.277
2007-01-01	546.376
2007-04-01	596.300
2007-07-01	642.886
2007-10-01	667.568
2008-01-01	715.777
2008-04-01	760.621
2008-07-01	704.594
2008-10-01	702.864
2009-01-01	695.318
2009-04-01	757.515
2009-07-01	813.817
2009-10-01	819.245
2010-01-01	776.108
2010-04-01	706.551
2010-07-01	808.424
2010-10-01	796.775
2011-01-01	855.630
2011-04-01	865.562
2011-07-01	819.544
2011-10-01	793.219
2012-01-01	846.012
2012-04-01	772.123
2012-07-01	771.692
2012-10-01	800.789
2013-01-01	770.467
2013-04-01	772.532
2013-07-01	770.439
2013-10-01	788.426
2014-01-01	760.136
2014-04-01	756.472
2014-07-01	684.545
2014-10-01	643.754
2015-01-01	567.823
2015-04-01	580.968