Quarter	Billions of US Dollars
1970-10-01	2.048
1971-01-01	2.143
1971-04-01	2.227
1971-07-01	2.346
1971-10-01	2.448
1972-01-01	2.319
1972-04-01	2.184
1972-07-01	2.047
1972-10-01	1.892
1973-01-01	2.166
1973-04-01	2.428
1973-07-01	2.521
1973-10-01	2.558
1974-01-01	3.492
1974-04-01	4.489
1974-07-01	5.106
1974-10-01	6.416
1975-01-01	6.494
1975-04-01	6.396
1975-07-01	5.702
1975-10-01	5.746
1976-01-01	5.970
1976-04-01	6.119
1976-07-01	6.373
1976-10-01	6.896
1977-01-01	6.956
1977-04-01	6.751
1977-07-01	6.876
1977-10-01	7.498
1978-01-01	7.477
1978-04-01	7.649
1978-07-01	8.426
1978-10-01	9.116
1979-01-01	9.305
1979-04-01	9.908
1979-07-01	10.966
1979-10-01	11.806
1980-01-01	11.829
1980-04-01	13.316
1980-07-01	13.770
1980-10-01	13.514
1981-01-01	13.208
1981-04-01	12.573
1981-07-01	13.043
1981-10-01	14.028
1982-01-01	13.881
1982-04-01	14.165
1982-07-01	14.494
1982-10-01	13.718
1983-01-01	13.912
1983-04-01	14.263
1983-07-01	14.607
1983-10-01	14.517
1984-01-01	15.601
1984-04-01	15.196
1984-07-01	14.829
1984-10-01	14.822
1985-01-01	15.616
1985-04-01	16.170
1985-07-01	18.489
1985-10-01	20.543
1986-01-01	22.128
1986-04-01	23.428
1986-07-01	25.040
1986-10-01	26.272
1987-01-01	29.122
1987-04-01	30.281
1987-07-01	32.174
1987-10-01	37.789
1988-01-01	39.215
1988-04-01	38.241
1988-07-01	39.154
1988-10-01	45.946
1989-01-01	46.673
1989-04-01	46.934
1989-07-01	50.199
1989-10-01	53.795
1990-01-01	54.911
1990-04-01	57.449
1990-07-01	61.811
1990-10-01	63.237
1991-01-01	56.470
1991-04-01	53.350
1991-07-01	57.542
1991-10-01	56.270
1992-01-01	51.496
1992-04-01	55.082
1992-07-01	50.917
1992-10-01	42.858
1993-01-01	37.674
1993-04-01	38.678
1993-07-01	37.356
1993-10-01	36.401
1994-01-01	38.382
1994-04-01	38.951
1994-07-01	42.129
1994-10-01	42.706
1995-01-01	46.983
1995-04-01	48.007
1995-07-01	48.489
1995-10-01	46.696
1996-01-01	43.268
1996-04-01	42.655
1996-07-01	42.756
1996-10-01	41.889
1997-01-01	39.200
1997-04-01	37.745
1997-07-01	37.494
1997-10-01	36.379
1998-01-01	35.356
1998-04-01	36.818
1998-07-01	40.720
1998-10-01	41.539
1999-01-01	38.873
1999-04-01	38.671
1999-07-01	41.343
1999-10-01	39.805
2000-01-01	38.394
2000-04-01	39.327
2000-07-01	37.158
2000-10-01	40.123
2001-01-01	38.734
2001-04-01	37.966
2001-07-01	41.648
2001-10-01	40.850
2002-01-01	40.926
2002-04-01	48.137
2002-07-01	48.824
2002-10-01	53.821
2003-01-01	56.776
2003-04-01	61.807
2003-07-01	65.665
2003-10-01	72.969
2004-01-01	72.304
2004-04-01	74.946
2004-07-01	78.989
2004-10-01	89.616
2005-01-01	87.184
2005-04-01	84.782
2005-07-01	87.761
2005-10-01	90.014
2006-01-01	94.282
2006-04-01	102.829
2006-07-01	105.480
2006-10-01	113.175
2007-01-01	116.757
2007-04-01	122.082
2007-07-01	132.123
2007-10-01	140.227
2008-01-01	153.427
2008-04-01	156.947
2008-07-01	145.285
2008-10-01	142.317
2009-01-01	136.794
2009-04-01	147.313
2009-07-01	154.806
2009-10-01	154.587
2010-01-01	146.412
2010-04-01	135.964
2010-07-01	153.558
2010-10-01	152.791
2011-01-01	163.863
2011-04-01	169.591
2011-07-01	160.936
2011-10-01	156.208
2012-01-01	162.813
2012-04-01	156.408
2012-07-01	162.978
2012-10-01	167.597
2013-01-01	163.568
2013-04-01	168.127
2013-07-01	175.005
2013-10-01	179.480
2014-01-01	180.408
2014-04-01	180.493
2014-07-01	168.125
2014-10-01	163.212
2015-01-01	145.687
2015-04-01	153.512
2015-07-01	155.394
2015-10-01	152.199
2016-01-01	159.729
2016-04-01	157.932
2016-07-01	160.655
2016-10-01	152.669
2017-01-01	155.532
2017-04-01	168.047
2017-07-01	176.008
2017-10-01	180.401
2018-01-01	185.440