Quarter	Billions of US Dollars
1967-01-01	1.015
1967-04-01	1.031
1967-07-01	1.060
1967-10-01	1.155
1968-01-01	1.158
1968-04-01	1.231
1968-07-01	1.234
1968-10-01	1.332
1969-01-01	1.356
1969-04-01	1.425
1969-07-01	1.450
1969-10-01	1.514
1970-01-01	1.505
1970-04-01	1.519
1970-07-01	1.551
1970-10-01	1.631
1971-01-01	1.746
1971-04-01	1.835
1971-07-01	1.936
1971-10-01	2.104
1972-01-01	2.276
1972-04-01	2.363
1972-07-01	2.505
1972-10-01	2.590
1973-01-01	3.016
1973-04-01	3.273
1973-07-01	3.427
1973-10-01	3.306
1974-01-01	3.489
1974-04-01	3.525
1974-07-01	3.542
1974-10-01	3.975
1975-01-01	4.239
1975-04-01	4.310
1975-07-01	4.082
1975-10-01	4.395
1976-01-01	4.689
1976-04-01	4.975
1976-07-01	5.233
1976-10-01	5.402
1977-01-01	5.657
1977-04-01	6.046
1977-07-01	6.331
1977-10-01	6.730
1978-01-01	6.874
1978-04-01	7.138
1978-07-01	7.652
1978-10-01	8.013
1979-01-01	8.451
1979-04-01	8.897
1979-07-01	9.361
1979-10-01	9.517
1980-01-01	9.294
1980-04-01	10.093
1980-07-01	10.724
1980-10-01	10.558
1981-01-01	11.312
1981-04-01	11.965
1981-07-01	12.028
1981-10-01	13.884
1982-01-01	14.370
1982-04-01	15.334
1982-07-01	15.657
1982-10-01	18.028
1983-01-01	18.983
1983-04-01	19.876
1983-07-01	20.654
1983-10-01	22.134
1984-01-01	23.212
1984-04-01	23.097
1984-07-01	23.265
1984-10-01	23.847
1985-01-01	23.162
1985-04-01	24.285
1985-07-01	24.746
1985-10-01	26.398
1986-01-01	25.857
1986-04-01	26.261
1986-07-01	27.027
1986-10-01	28.476
1987-01-01	30.137
1987-04-01	30.842
1987-07-01	31.558
1987-10-01	33.116
1988-01-01	32.787
1988-04-01	32.454
1988-07-01	31.948
1988-10-01	32.848
1989-01-01	33.404
1989-04-01	33.513
1989-07-01	33.369
1989-10-01	33.301
1990-01-01	33.251
1990-04-01	33.454
1990-07-01	34.302
1990-10-01	35.046
1991-01-01	33.971
1991-04-01	33.967
1991-07-01	35.484
1991-10-01	36.397
1992-01-01	37.395
1992-04-01	39.412
1992-07-01	39.589
1992-10-01	37.053
1993-01-01	37.479
1993-04-01	37.757
1993-07-01	38.075
1993-10-01	35.584
1994-01-01	35.285
1994-04-01	37.251
1994-07-01	37.351
1994-10-01	36.437
1995-01-01	36.614
1995-04-01	37.475
1995-07-01	36.914
1995-10-01	35.972
1996-01-01	35.715
1996-04-01	36.402
1996-07-01	36.101
1996-10-01	35.503
1997-01-01	34.517
1997-04-01	33.089
1997-07-01	26.478
1997-10-01	23.145
1998-01-01	23.980
1998-04-01	22.024
1998-07-01	23.479
1998-10-01	27.137
1999-01-01	27.236
1999-04-01	28.742
1999-07-01	28.909
1999-10-01	29.526
2000-01-01	30.159
2000-04-01	31.781
2000-07-01	32.570
2000-10-01	33.039
2001-01-01	33.928
2001-04-01	34.016
2001-07-01	36.362
2001-10-01	38.365
2002-01-01	38.416
2002-04-01	39.371
2002-07-01	41.231
2002-10-01	43.404
2003-01-01	46.133
2003-04-01	47.924
2003-07-01	49.619
2003-10-01	49.649
2004-01-01	51.110
2004-04-01	52.048
2004-07-01	53.785
2004-10-01	56.960
2005-01-01	58.715
2005-04-01	58.570
2005-07-01	60.393
2005-10-01	60.506
2006-01-01	63.046
2006-04-01	65.366
2006-07-01	66.659
2006-10-01	68.619
2007-01-01	72.308
2007-04-01	75.340
2007-07-01	79.682
2007-10-01	80.654
2008-01-01	86.001
2008-04-01	87.260
2008-07-01	83.688
2008-10-01	88.758
2009-01-01	86.997
2009-04-01	95.510
2009-07-01	102.359
2009-10-01	105.837
2010-01-01	115.972
2010-04-01	119.879
2010-07-01	128.944
2010-10-01	132.836
2011-01-01	142.175
2011-04-01	144.834
2011-07-01	137.762
2011-10-01	143.753
2012-01-01	153.667
2012-04-01	150.186
2012-07-01	158.254
2012-10-01	164.034
2013-01-01	164.350
2013-04-01	164.306
2013-07-01	162.059
2013-10-01	164.641
2014-01-01	171.847
2014-04-01	177.170
2014-07-01	173.403
2014-10-01	166.603
2015-01-01	161.034
2015-04-01	166.437
2015-07-01	141.831
2015-10-01	146.185
2016-01-01	161.915
2016-04-01	164.331
2016-07-01	155.654
2016-10-01	144.555
2017-01-01	150.148
2017-04-01	159.594
2017-07-01	162.879
2017-10-01	169.715
2018-01-01	182.268