Quarter	Billions of US Dollars
1964-10-01	0.996
1965-01-01	1.013
1965-04-01	1.052
1965-07-01	1.095
1965-10-01	1.133
1966-01-01	1.154
1966-04-01	1.217
1966-07-01	1.278
1966-10-01	1.333
1967-01-01	1.378
1967-04-01	1.439
1967-07-01	1.505
1967-10-01	1.539
1968-01-01	1.542
1968-04-01	1.571
1968-07-01	1.626
1968-10-01	1.688
1969-01-01	0.666
1969-04-01	0.683
1969-07-01	0.705
1969-10-01	0.720
1970-01-01	0.725
1970-04-01	0.758
1970-07-01	0.793
1970-10-01	0.841
1971-01-01	0.856
1971-04-01	0.901
1971-07-01	0.946
1971-10-01	1.071
1972-01-01	1.097
1972-04-01	1.148
1972-07-01	1.199
1972-10-01	1.243
1973-01-01	1.404
1973-04-01	1.469
1973-07-01	1.643
1973-10-01	1.698
1974-01-01	1.735
1974-04-01	1.808
1974-07-01	1.890
1974-10-01	1.981
1975-01-01	2.305
1975-04-01	2.409
1975-07-01	2.535
1975-10-01	2.651
1976-01-01	1.337
1976-04-01	1.399
1976-07-01	1.477
1976-10-01	1.566
1977-01-01	1.611
1977-04-01	1.689
1977-07-01	1.802
1977-10-01	1.868
1978-01-01	1.973
1978-04-01	2.120
1978-07-01	2.241
1978-10-01	2.453
1979-01-01	2.507
1979-04-01	2.614
1979-07-01	2.707
1979-10-01	2.805
1980-01-01	3.219
1980-04-01	3.309
1980-07-01	3.445
1980-10-01	3.577
1981-01-01	3.476
1981-04-01	3.474
1981-07-01	3.494
1981-10-01	3.747
1982-01-01	3.774
1982-04-01	3.782
1982-07-01	3.634
1982-10-01	3.608
1983-01-01	3.629
1983-04-01	3.600
1983-07-01	3.584
1983-10-01	3.657
1984-01-01	3.762
1984-04-01	3.670
1984-07-01	3.727
1984-10-01	3.752
1985-01-01	3.896
1985-04-01	4.092
1985-07-01	4.433
1985-10-01	4.663
1986-01-01	4.868
1986-04-01	5.170
1986-07-01	5.293
1986-10-01	5.519
1987-01-01	5.497
1987-04-01	5.691
1987-07-01	5.908
1987-10-01	6.312
1988-01-01	6.320
1988-04-01	6.191
1988-07-01	5.906
1988-10-01	6.211
1989-01-01	5.868
1989-04-01	5.647
1989-07-01	6.074
1989-10-01	5.726
1990-01-01	5.504
1990-04-01	5.757
1990-07-01	6.297
1990-10-01	6.403
1991-01-01	4.705
1991-04-01	3.616
1991-07-01	3.768
1991-10-01	3.611
1992-01-01	3.393
1992-04-01	3.514
1992-07-01	3.687
1992-10-01	3.462
1993-01-01	3.363
1993-04-01	3.395
1993-07-01	3.324
1993-10-01	3.322
1994-01-01	3.328
1994-04-01	3.417
1994-07-01	3.379
1994-10-01	3.396
1995-01-01	3.073
1995-04-01	2.883
1995-07-01	2.703
1995-10-01	2.517
1996-01-01	2.349
1996-04-01	2.226
1996-07-01	2.118
1996-10-01	2.016
1997-01-01	1.829
1997-04-01	1.774
1997-07-01	1.752
1997-10-01	1.897
1998-01-01	1.798
1998-04-01	1.773
1998-07-01	1.844
1998-10-01	1.861
1999-01-01	1.751
1999-04-01	1.838
1999-07-01	2.008
1999-10-01	2.082
2000-01-01	2.090
2000-04-01	2.313
2000-07-01	2.328
2000-10-01	2.765
2001-01-01	2.834
2001-04-01	3.363
2001-07-01	3.846
2001-10-01	4.388
2002-01-01	4.692
2002-04-01	6.171
2002-07-01	7.179
2002-10-01	8.930
2003-01-01	9.793
2003-04-01	10.934
2003-07-01	13.136
2003-10-01	15.448
2004-01-01	16.656
2004-04-01	17.776
2004-07-01	19.668
2004-10-01	23.111
2005-01-01	22.615
2005-04-01	22.467
2005-07-01	23.714
2005-10-01	24.525
2006-01-01	25.119
2006-04-01	27.157
2006-07-01	29.188
2006-10-01	33.069
2007-01-01	34.875
2007-04-01	37.258
2007-07-01	41.174
2007-10-01	44.504
2008-01-01	50.918
2008-04-01	54.760
2008-07-01	51.924
2008-10-01	51.507
2009-01-01	46.781
2009-04-01	51.477
2009-07-01	53.621
2009-10-01	52.801
2010-01-01	50.571
2010-04-01	46.625
2010-07-01	51.942
2010-10-01	51.643
2011-01-01	53.654
2011-04-01	56.220
2011-07-01	49.990
2011-10-01	43.521
2012-01-01	43.774
2012-04-01	41.284
2012-07-01	41.617
2012-10-01	41.035
2013-01-01	38.284
2013-04-01	38.810
2013-07-01	39.420
2013-10-01	39.295
2014-01-01	38.034
2014-04-01	37.115
2014-07-01	33.860
2014-10-01	31.885
2015-01-01	27.748
2015-04-01	26.959
2015-07-01	26.692
2015-10-01	25.180
2016-01-01	26.119
2016-04-01	25.032
2016-07-01	25.768
2016-10-01	24.402
2017-01-01	24.867
2017-04-01	26.571
2017-07-01	27.535
2017-10-01	27.698
2018-01-01	28.320