Quarter	Billions of US Dollars
1967-10-01	8.092
1968-01-01	8.215
1968-04-01	8.338
1968-07-01	8.463
1968-10-01	8.587
1969-01-01	3.396
1969-04-01	3.432
1969-07-01	3.468
1969-10-01	3.504
1970-01-01	3.586
1970-04-01	3.669
1970-07-01	3.753
1970-10-01	3.837
1971-01-01	4.056
1971-04-01	4.278
1971-07-01	4.503
1971-10-01	5.132
1972-01-01	5.200
1972-04-01	5.269
1972-07-01	5.337
1972-10-01	5.406
1973-01-01	6.093
1973-04-01	6.181
1973-07-01	6.669
1973-10-01	6.763
1974-01-01	6.893
1974-04-01	7.193
1974-07-01	7.490
1974-10-01	7.864
1975-01-01	9.013
1975-04-01	9.205
1975-07-01	9.436
1975-10-01	9.486
1976-01-01	4.893
1976-04-01	5.224
1976-07-01	5.405
1976-10-01	5.601
1977-01-01	5.795
1977-04-01	5.999
1977-07-01	6.290
1977-10-01	6.430
1978-01-01	7.085
1978-04-01	7.604
1978-07-01	7.909
1978-10-01	8.513
1979-01-01	9.011
1979-04-01	9.355
1979-07-01	9.645
1979-10-01	9.481
1980-01-01	11.351
1980-04-01	11.513
1980-07-01	11.689
1980-10-01	11.466
1981-01-01	11.431
1981-04-01	11.226
1981-07-01	10.959
1981-10-01	11.471
1982-01-01	11.791
1982-04-01	11.609
1982-07-01	10.816
1982-10-01	10.547
1983-01-01	10.830
1983-04-01	10.356
1983-07-01	9.994
1983-10-01	9.903
1984-01-01	10.304
1984-04-01	9.772
1984-07-01	9.684
1984-10-01	9.569
1985-01-01	9.955
1985-04-01	10.437
1985-07-01	11.074
1985-10-01	11.416
1986-01-01	11.958
1986-04-01	12.610
1986-07-01	12.702
1986-10-01	13.139
1987-01-01	13.119
1987-04-01	13.412
1987-07-01	13.783
1987-10-01	14.735
1988-01-01	14.390
1988-04-01	13.874
1988-07-01	13.148
1988-10-01	13.878
1989-01-01	13.680
1989-04-01	13.212
1989-07-01	14.700
1989-10-01	13.433
1990-01-01	13.028
1990-04-01	13.916
1990-07-01	15.375
1990-10-01	16.209
1991-01-01	13.520
1991-04-01	12.723
1991-07-01	13.432
1991-10-01	13.779
1992-01-01	12.629
1992-04-01	13.351
1992-07-01	13.889
1992-10-01	11.924
1993-01-01	11.680
1993-04-01	11.618
1993-07-01	11.275
1993-10-01	11.048
1994-01-01	11.232
1994-04-01	11.974
1994-07-01	11.850
1994-10-01	12.156
1995-01-01	11.337
1995-04-01	10.845
1995-07-01	10.646
1995-10-01	10.164
1996-01-01	9.455
1996-04-01	9.082
1996-07-01	9.355
1996-10-01	9.954
1997-01-01	9.735
1997-04-01	9.917
1997-07-01	10.126
1997-10-01	10.551
1998-01-01	10.338
1998-04-01	10.683
1998-07-01	11.327
1998-10-01	11.479
1999-01-01	10.808
1999-04-01	10.953
1999-07-01	11.440
1999-10-01	11.605
2000-01-01	11.401
2000-04-01	12.154
2000-07-01	12.046
2000-10-01	13.479
2001-01-01	13.301
2001-04-01	14.161
2001-07-01	15.297
2001-10-01	15.597
2002-01-01	15.892
2002-04-01	18.901
2002-07-01	20.122
2002-10-01	22.400
2003-01-01	23.787
2003-04-01	25.277
2003-07-01	28.874
2003-10-01	32.428
2004-01-01	34.437
2004-04-01	35.569
2004-07-01	38.518
2004-10-01	44.412
2005-01-01	43.291
2005-04-01	41.262
2005-07-01	42.944
2005-10-01	44.407
2006-01-01	45.213
2006-04-01	47.507
2006-07-01	51.279
2006-10-01	58.784
2007-01-01	60.988
2007-04-01	64.714
2007-07-01	70.767
2007-10-01	76.901
2008-01-01	86.385
2008-04-01	92.178
2008-07-01	86.819
2008-10-01	82.726
2009-01-01	74.917
2009-04-01	82.638
2009-07-01	85.348
2009-10-01	82.948
2010-01-01	78.791
2010-04-01	70.996
2010-07-01	79.525
2010-10-01	78.271
2011-01-01	82.062
2011-04-01	84.732
2011-07-01	75.671
2011-10-01	67.368
2012-01-01	68.769
2012-04-01	64.617
2012-07-01	65.392
2012-10-01	64.516
2013-01-01	60.960
2013-04-01	61.923
2013-07-01	64.075
2013-10-01	63.364
2014-01-01	61.168
2014-04-01	60.196
2014-07-01	55.208
2014-10-01	52.348
2015-01-01	45.577
2015-04-01	44.293
2015-07-01	44.041
2015-10-01	40.972
2016-01-01	43.043
2016-04-01	41.244
2016-07-01	42.474
2016-10-01	40.194
2017-01-01	41.533
2017-04-01	44.566
2017-07-01	46.883
2017-10-01	48.061
2018-01-01	49.757