Quarter	Billions of US Dollars
1970-10-01	10.289
1971-01-01	10.015
1971-04-01	9.888
1971-07-01	10.079
1971-10-01	10.352
1972-01-01	10.749
1972-04-01	11.221
1972-07-01	11.774
1972-10-01	12.259
1973-01-01	13.903
1973-04-01	15.479
1973-07-01	16.012
1973-10-01	16.233
1974-01-01	17.566
1974-04-01	19.008
1974-07-01	18.901
1974-10-01	21.335
1975-01-01	22.690
1975-04-01	23.467
1975-07-01	21.933
1975-10-01	23.173
1976-01-01	24.017
1976-04-01	24.526
1976-07-01	25.473
1976-10-01	27.394
1977-01-01	27.739
1977-04-01	26.947
1977-07-01	27.415
1977-10-01	29.784
1978-01-01	29.238
1978-04-01	29.387
1978-07-01	31.821
1978-10-01	33.823
1979-01-01	33.956
1979-04-01	35.544
1979-07-01	38.681
1979-10-01	40.973
1980-01-01	40.734
1980-04-01	45.524
1980-07-01	46.764
1980-10-01	45.625
1981-01-01	44.364
1981-04-01	42.029
1981-07-01	43.403
1981-10-01	46.487
1982-01-01	45.891
1982-04-01	46.726
1982-07-01	47.718
1982-10-01	45.068
1983-01-01	45.336
1983-04-01	46.123
1983-07-01	46.901
1983-10-01	46.264
1984-01-01	49.468
1984-04-01	47.958
1984-07-01	46.617
1984-10-01	46.423
1985-01-01	48.732
1985-04-01	50.249
1985-07-01	57.271
1985-10-01	63.506
1986-01-01	68.043
1986-04-01	71.751
1986-07-01	76.312
1986-10-01	79.661
1987-01-01	87.311
1987-04-01	90.031
1987-07-01	94.991
1987-10-01	110.880
1988-01-01	112.567
1988-04-01	107.690
1988-07-01	108.262
1988-10-01	126.285
1989-01-01	128.123
1989-04-01	128.722
1989-07-01	137.539
1989-10-01	146.560
1990-01-01	153.987
1990-04-01	166.025
1990-07-01	183.647
1990-10-01	192.365
1991-01-01	173.138
1991-04-01	164.957
1991-07-01	179.599
1991-10-01	177.031
1992-01-01	168.653
1992-04-01	187.620
1992-07-01	180.253
1992-10-01	157.706
1993-01-01	137.154
1993-04-01	139.196
1993-07-01	132.831
1993-10-01	127.938
1994-01-01	136.066
1994-04-01	139.369
1994-07-01	152.193
1994-10-01	155.729
1995-01-01	168.578
1995-04-01	169.450
1995-07-01	168.353
1995-10-01	159.546
1996-01-01	149.732
1996-04-01	149.503
1996-07-01	151.854
1996-10-01	150.699
1997-01-01	143.901
1997-04-01	141.358
1997-07-01	143.100
1997-10-01	141.688
1998-01-01	137.284
1998-04-01	141.062
1998-07-01	152.331
1998-10-01	152.733
1999-01-01	146.888
1999-04-01	146.698
1999-07-01	152.066
1999-10-01	143.236
2000-01-01	140.397
2000-04-01	144.560
2000-07-01	141.976
2000-10-01	154.564
2001-01-01	149.469
2001-04-01	146.474
2001-07-01	157.538
2001-10-01	149.623
2002-01-01	157.884
2002-04-01	179.709
2002-07-01	177.303
2002-10-01	186.061
2003-01-01	195.044
2003-04-01	210.640
2003-07-01	217.910
2003-10-01	240.278
2004-01-01	237.975
2004-04-01	243.128
2004-07-01	250.974
2004-10-01	278.785
2005-01-01	269.293
2005-04-01	259.446
2005-07-01	260.691
2005-10-01	260.209
2006-01-01	276.507
2006-04-01	300.800
2006-07-01	306.508
2006-10-01	318.740
2007-01-01	330.582
2007-04-01	347.029
2007-07-01	372.246
2007-10-01	398.783
2008-01-01	434.731
2008-04-01	451.542
2008-07-01	423.043
2008-10-01	422.132
2009-01-01	411.119
2009-04-01	443.939
2009-07-01	444.008
2009-10-01	432.547
2010-01-01	414.139
2010-04-01	388.635
2010-07-01	436.041
2010-10-01	424.909
2011-01-01	457.008
2011-04-01	469.957
2011-07-01	444.210
2011-10-01	430.864
2012-01-01	451.286
2012-04-01	428.480
2012-07-01	442.555
2012-10-01	455.031
2013-01-01	454.025
2013-04-01	465.698
2013-07-01	483.099
2013-10-01	496.588
2014-01-01	495.963
2014-04-01	493.402
2014-07-01	457.009
2014-10-01	458.458
2015-01-01	418.112
2015-04-01	445.737
2015-07-01	454.866
2015-10-01	440.896
2016-01-01	458.810
2016-04-01	444.641
2016-07-01	444.144
2016-10-01	416.199
2017-01-01	431.976
2017-04-01	458.807
2017-07-01	476.849
2017-10-01	483.876
2018-01-01	500.863