Quarter	Billions of US Dollars
1971-01-01	0.030
1971-04-01	0.030
1971-07-01	0.030
1971-10-01	0.030
1972-01-01	0.030
1972-04-01	0.065
1972-07-01	0.065
1972-10-01	0.065
1973-01-01	0.065
1973-04-01	0.065
1973-07-01	0.065
1973-10-01	0.065
1974-01-01	0.065
1974-04-01	0.089
1974-07-01	0.129
1974-10-01	0.151
1975-01-01	0.168
1975-04-01	0.402
1975-07-01	0.402
1975-10-01	0.406
1976-01-01	0.517
1976-04-01	0.515
1976-07-01	0.620
1976-10-01	0.721
1977-01-01	0.716
1977-04-01	0.842
1977-07-01	0.965
1977-10-01	1.001
1978-01-01	1.075
1978-04-01	1.073
1978-07-01	1.166
1978-10-01	1.243
1979-01-01	1.326
1979-04-01	1.335
1979-07-01	1.462
1979-10-01	1.429
1980-01-01	1.349
1980-04-01	1.382
1980-07-01	1.385
1980-10-01	1.364
1981-01-01	1.232
1981-04-01	1.209
1981-07-01	1.240
1981-10-01	1.292
1982-01-01	1.268
1982-04-01	1.376
1982-07-01	1.352
1982-10-01	2.074
1983-01-01	2.262
1983-04-01	2.730
1983-07-01	2.775
1983-10-01	2.926
1984-01-01	2.984
1984-04-01	3.054
1984-07-01	3.312
1984-10-01	3.672
1985-01-01	3.779
1985-04-01	3.909
1985-07-01	4.299
1985-10-01	4.261
1986-01-01	4.845
1986-04-01	5.230
1986-07-01	5.862
1986-10-01	6.040
1987-01-01	6.579
1987-04-01	7.101
1987-07-01	7.191
1987-10-01	7.661
1988-01-01	7.365
1988-04-01	7.457
1988-07-01	7.416
1988-10-01	8.355
1989-01-01	8.432
1989-04-01	8.063
1989-07-01	8.025
1989-10-01	8.367
1990-01-01	8.749
1990-04-01	8.538
1990-07-01	9.117
1990-10-01	9.607
1991-01-01	9.489
1991-04-01	11.151
1991-07-01	12.638
1991-10-01	13.493
1992-01-01	13.652
1992-04-01	14.221
1992-07-01	14.693
1992-10-01	14.656
1993-01-01	15.015
1993-04-01	16.127
1993-07-01	18.829
1993-10-01	18.680
1994-01-01	20.287
1994-04-01	19.861
1994-07-01	21.401
1994-10-01	23.346
1995-01-01	25.253
1995-04-01	27.009
1995-07-01	29.116
1995-10-01	30.090
1996-01-01	31.208
1996-04-01	34.560
1996-07-01	34.049
1996-10-01	34.408
1997-01-01	36.324
1997-04-01	39.163
1997-07-01	44.779
1997-10-01	50.329
1998-01-01	52.714
1998-04-01	59.539
1998-07-01	64.878
1998-10-01	64.804
1999-01-01	64.734
1999-04-01	65.549
1999-07-01	70.251
1999-10-01	67.202
2000-01-01	65.540
2000-04-01	71.353
2000-07-01	70.682
2000-10-01	82.763
2001-01-01	81.792
2001-04-01	81.672
2001-07-01	87.059
2001-10-01	86.917
2002-01-01	88.084
2002-04-01	103.378
2002-07-01	102.300
2002-10-01	106.970
2003-01-01	109.357
2003-04-01	110.239
2003-07-01	120.149
2003-10-01	135.339
2004-01-01	160.997
2004-04-01	172.183
2004-07-01	192.403
2004-10-01	224.434
2005-01-01	224.746
2005-04-01	217.749
2005-07-01	241.649
2005-10-01	238.449
2006-01-01	250.578
2006-04-01	263.459
2006-07-01	271.532
2006-10-01	272.364
2007-01-01	292.291
2007-04-01	315.318
2007-07-01	337.614
2007-10-01	331.136
2008-01-01	352.126
2008-04-01	384.770
2008-07-01	364.127
2008-10-01	335.223
2009-01-01	348.912
2009-04-01	380.966
2009-07-01	391.970
2009-10-01	381.911
2010-01-01	379.911
2010-04-01	354.196
2010-07-01	388.254
2010-10-01	369.817
2011-01-01	385.261
2011-04-01	384.597
2011-07-01	366.608
2011-10-01	354.421
2012-01-01	373.228
2012-04-01	356.333
2012-07-01	364.584
2012-10-01	379.213
2013-01-01	355.600
2013-04-01	344.608
2013-07-01	341.410
2013-10-01	344.360
2014-01-01	347.214
2014-04-01	363.933
2014-07-01	361.392
2014-10-01	351.815
2015-01-01	338.324
2015-04-01	366.680