Quarter	Billions of US Dollars
1969-01-01	0.095
1969-04-01	0.015
1971-10-01	0.060
1972-01-01	0.202
1972-04-01	0.031
1972-07-01	0.073
1972-10-01	0.045
1973-01-01	0.085
1973-04-01	0.022
1973-07-01	0.078
1974-01-01	0.019
1974-04-01	0.100
1974-07-01	0.213
1974-10-01	0.244
1975-01-01	0.214
1975-04-01	0.348
1975-07-01	0.138
1975-10-01	0.047
1976-01-01	0.335
1976-04-01	0.317
1976-07-01	0.114
1976-10-01	0.080
1977-01-01	0.565
1977-04-01	0.213
1977-07-01	0.218
1977-10-01	0.574
1978-01-01	0.299
1978-04-01	0.127
1978-07-01	0.159
1978-10-01	0.034
1979-01-01	0.495
1979-04-01	0.199
1979-07-01	0.176
1979-10-01	0.178
1980-01-01	0.137
1980-04-01	0.576
1980-07-01	0.326
1980-10-01	0.296
1981-01-01	0.302
1981-04-01	0.154
1981-07-01	0.235
1981-10-01	0.299
1982-01-01	0.096
1982-04-01	0.353
1982-07-01	0.607
1982-10-01	0.124
1983-01-01	0.219
1983-04-01	0.498
1983-07-01	0.195
1983-10-01	0.228
1984-01-01	0.596
1984-04-01	0.255
1984-07-01	0.109
1984-10-01	0.560
1985-01-01	0.272
1985-04-01	0.367
1985-07-01	0.344
1985-10-01	1.146
1986-01-01	0.944
1986-04-01	0.551
1986-07-01	1.098
1986-10-01	0.959
1987-01-01	0.936
1987-04-01	0.896
1987-07-01	0.367
1987-10-01	0.222
1988-01-01	1.253
1988-04-01	1.257
1988-07-01	0.447
1988-10-01	0.897
1989-01-01	0.940
1989-04-01	0.939
1989-07-01	0.657
1989-10-01	1.251
1990-01-01	1.445
1990-04-01	0.763
1990-07-01	0.779
1990-10-01	1.183
1991-01-01	1.963
1991-04-01	1.532
1991-07-01	1.517
1991-10-01	2.953
1992-01-01	2.784
1992-04-01	1.387
1992-07-01	1.377
1992-10-01	1.877
1993-01-01	1.744
1993-04-01	2.541
1993-07-01	3.653
1993-10-01	2.268
1994-01-01	2.611
1994-04-01	2.660
1994-07-01	5.513
1994-10-01	4.977
1995-01-01	3.322
1995-04-01	4.189
1995-07-01	3.883
1995-10-01	3.588
1996-01-01	7.219
1996-04-01	8.792
1996-07-01	4.156
1996-10-01	7.254
1997-01-01	7.679
1997-04-01	7.478
1997-07-01	9.914
1997-10-01	5.828
1998-01-01	8.706
1998-04-01	6.240
1998-07-01	13.298
1998-10-01	12.639
1999-01-01	13.779
1999-04-01	14.782
1999-07-01	17.104
1999-10-01	12.263
2000-01-01	12.451
2000-04-01	21.951
2000-07-01	20.068
2000-10-01	32.229
2001-01-01	17.415
2001-04-01	27.477
2001-07-01	15.447
2001-10-01	25.001
2002-01-01	20.275
2002-04-01	20.706
2002-07-01	23.447
2002-10-01	20.716
2003-01-01	25.861
2003-04-01	40.692
2003-07-01	29.910
2003-10-01	39.914
2004-01-01	36.918
2004-04-01	31.042
2004-07-01	26.825
2004-10-01	40.517
2005-01-01	42.604
2005-04-01	39.554
2005-07-01	34.847
2005-10-01	53.941
2006-01-01	47.164
2006-04-01	55.211
2006-07-01	47.960
2006-10-01	67.765
2007-01-01	69.170
2007-04-01	57.445
2007-07-01	38.283
2007-10-01	37.442
2008-01-01	49.589
2008-04-01	84.101
2008-07-01	26.877
2008-10-01	71.275
2009-01-01	90.604
2009-04-01	84.640
2009-07-01	44.461
2009-10-01	46.941
2010-01-01	104.769
2010-04-01	39.022
2010-07-01	68.657
2010-10-01	43.297
2011-01-01	72.469
2011-04-01	67.426
2011-07-01	39.764
2011-10-01	64.595
2012-01-01	79.508
2012-04-01	40.271
2012-07-01	74.140
2012-10-01	43.019
2013-01-01	51.297
2013-04-01	49.016
2013-07-01	55.509
2013-10-01	49.562
2014-01-01	86.107
2014-04-01	67.792
2014-07-01	42.802
2014-10-01	34.274
2015-01-01	55.381
2015-04-01	58.664