Quarter	Billions of US Dollars
1971-01-01	0.086
1971-04-01	0.051
1971-07-01	0.025
1971-10-01	0.081
1972-01-01	0.253
1972-04-01	0.179
1972-07-01	0.209
1972-10-01	0.400
1973-01-01	0.191
1973-04-01	0.362
1973-07-01	0.147
1973-10-01	0.528
1974-01-01	0.130
1974-04-01	0.528
1974-07-01	0.032
1974-10-01	0.166
1975-01-01	0.355
1975-04-01	0.572
1975-07-01	0.187
1975-10-01	0.190
1976-01-01	0.204
1976-04-01	0.478
1976-07-01	0.627
1976-10-01	0.598
1977-01-01	0.694
1977-04-01	0.864
1977-07-01	1.261
1977-10-01	1.338
1978-01-01	1.744
1978-04-01	1.386
1978-07-01	0.906
1978-10-01	1.224
1979-01-01	1.045
1979-04-01	0.730
1979-07-01	0.876
1979-10-01	0.337
1980-01-01	0.193
1980-04-01	0.879
1980-07-01	0.590
1980-10-01	0.406
1981-01-01	0.408
1981-04-01	1.012
1981-07-01	0.625
1981-10-01	0.999
1982-01-01	1.315
1982-04-01	0.798
1982-07-01	0.370
1982-10-01	0.620
1983-01-01	0.316
1983-04-01	0.536
1983-07-01	1.363
1983-10-01	0.363
1984-01-01	0.792
1984-04-01	0.652
1984-07-01	0.614
1984-10-01	1.649
1985-01-01	1.895
1985-04-01	1.875
1985-07-01	1.813
1985-10-01	1.664
1986-01-01	1.907
1986-04-01	1.013
1986-07-01	0.454
1986-10-01	0.397
1987-01-01	0.797
1987-04-01	0.519
1987-07-01	0.966
1987-10-01	0.503
1988-01-01	1.713
1988-04-01	1.201
1988-07-01	1.784
1988-10-01	1.619
1989-01-01	2.009
1989-04-01	0.736
1989-07-01	2.760
1989-10-01	1.135
1990-01-01	37.014
1990-04-01	2.890
1990-07-01	2.337
1990-10-01	17.832
1991-01-01	4.839
1991-04-01	3.392
1991-07-01	3.394
1991-10-01	3.687
1992-01-01	6.797
1992-04-01	20.963
1992-07-01	4.485
1992-10-01	8.965
1993-01-01	7.043
1993-04-01	9.054
1993-07-01	8.536
1993-10-01	26.671
1994-01-01	12.667
1994-04-01	49.894
1994-07-01	14.397
1994-10-01	14.562
1995-01-01	9.630
1995-04-01	10.469
1995-07-01	15.560
1995-10-01	12.237
1996-01-01	17.729
1996-04-01	30.014
1996-07-01	33.314
1996-10-01	27.491
1997-01-01	31.399
1997-04-01	37.026
1997-07-01	35.522
1997-10-01	10.636
1998-01-01	21.582
1998-04-01	26.068
1998-07-01	15.761
1998-10-01	10.364
1999-01-01	14.227
1999-04-01	23.208
1999-07-01	10.531
1999-10-01	20.837
2000-01-01	53.384
2000-04-01	15.804
2000-07-01	25.203
2000-10-01	5.686
2001-01-01	22.880
2001-04-01	50.265
2001-07-01	9.255
2001-10-01	19.244
2002-01-01	20.243
2002-04-01	22.735
2002-07-01	10.926
2002-10-01	23.709
2003-01-01	27.407
2003-04-01	33.071
2003-07-01	22.184
2003-10-01	21.784
2004-01-01	36.158
2004-04-01	27.889
2004-07-01	24.304
2004-10-01	23.473
2005-01-01	53.057
2005-04-01	35.003
2005-07-01	34.704
2005-10-01	35.165
2006-01-01	42.948
2006-04-01	19.537
2006-07-01	30.270
2006-10-01	50.859
2007-01-01	53.315
2007-04-01	52.257
2007-07-01	26.204
2007-10-01	26.541
2008-01-01	20.697
2008-04-01	45.901
2008-07-01	17.036
2008-10-01	4.799
2009-01-01	29.040
2009-04-01	48.876
2009-07-01	53.965
2009-10-01	60.970
2010-01-01	57.291
2010-04-01	48.536
2010-07-01	69.235
2010-10-01	50.503
2011-01-01	72.731
2011-04-01	71.032
2011-07-01	39.596
2011-10-01	58.451
2012-01-01	91.504
2012-04-01	62.085
2012-07-01	84.557
2012-10-01	96.872
2013-01-01	75.502
2013-04-01	79.594
2013-07-01	81.842
2013-10-01	87.155
2014-01-01	77.374
2014-04-01	114.442
2014-07-01	79.533
2014-10-01	93.178
2015-01-01	83.929
2015-04-01	78.064