Quarter	Billions of US Dollars
1969-10-01	0.050
1970-01-01	0.077
1970-04-01	0.078
1970-07-01	0.078
1970-10-01	0.077
1971-01-01	0.089
1971-04-01	0.090
1971-07-01	0.092
1971-10-01	0.093
1972-01-01	0.093
1972-04-01	0.120
1972-07-01	0.119
1972-10-01	0.120
1973-01-01	0.130
1973-04-01	0.156
1973-07-01	0.156
1973-10-01	0.148
1974-01-01	0.159
1974-04-01	0.178
1974-07-01	0.175
1974-10-01	0.190
1975-01-01	0.192
1975-04-01	0.193
1975-07-01	0.197
1975-10-01	0.202
1976-01-01	0.206
1976-04-01	0.200
1976-07-01	0.278
1976-10-01	0.354
1977-01-01	0.390
1977-04-01	0.407
1977-07-01	0.547
1977-10-01	0.576
1978-01-01	0.615
1978-04-01	0.614
1978-07-01	0.679
1978-10-01	0.676
1979-01-01	0.692
1979-04-01	0.697
1979-07-01	1.697
1979-10-01	2.221
1980-01-01	2.005
1980-04-01	2.300
1980-07-01	2.263
1980-10-01	2.149
1981-01-01	2.150
1981-04-01	1.969
1981-07-01	1.998
1981-10-01	2.202
1982-01-01	2.122
1982-04-01	2.098
1982-07-01	2.061
1982-10-01	2.237
1983-01-01	2.387
1983-04-01	2.370
1983-07-01	2.355
1983-10-01	2.698
1984-01-01	2.872
1984-04-01	2.921
1984-07-01	3.237
1984-10-01	3.660
1985-01-01	4.232
1985-04-01	4.691
1985-07-01	5.910
1985-10-01	6.298
1986-01-01	7.619
1986-04-01	8.690
1986-07-01	9.946
1986-10-01	10.598
1987-01-01	11.433
1987-04-01	11.902
1987-07-01	12.314
1987-10-01	13.166
1988-01-01	13.357
1988-04-01	13.305
1988-07-01	14.044
1988-10-01	15.169
1989-01-01	15.347
1989-04-01	15.486
1989-07-01	16.191
1989-10-01	18.186
1990-01-01	19.419
1990-04-01	21.559
1990-07-01	22.780
1990-10-01	24.393
1991-01-01	25.457
1991-04-01	26.885
1991-07-01	29.152
1991-10-01	33.490
1992-01-01	34.008
1992-04-01	37.346
1992-07-01	39.038
1992-10-01	36.527
1993-01-01	37.788
1993-04-01	38.582
1993-07-01	44.419
1993-10-01	45.878
1994-01-01	48.316
1994-04-01	50.992
1994-07-01	54.565
1994-10-01	56.865
1995-01-01	62.872
1995-04-01	65.846
1995-07-01	67.704
1995-10-01	71.279
1996-01-01	70.244
1996-04-01	69.404
1996-07-01	72.868
1996-10-01	74.573
1997-01-01	73.270
1997-04-01	75.097
1997-07-01	76.822
1997-10-01	76.685
1998-01-01	77.588
1998-04-01	78.461
1998-07-01	81.808
1998-10-01	82.081
1999-01-01	81.087
1999-04-01	81.056
1999-07-01	84.242
1999-10-01	82.059
2000-01-01	81.274
2000-04-01	84.579
2000-07-01	79.569
2000-10-01	83.704
2001-01-01	87.663
2001-04-01	90.783
2001-07-01	97.346
2001-10-01	93.464
2002-01-01	97.125
2002-04-01	112.137
2002-07-01	113.411
2002-10-01	118.153
2003-01-01	126.477
2003-04-01	132.065
2003-07-01	135.963
2003-10-01	147.908
2004-01-01	146.023
2004-04-01	141.909
2004-07-01	153.115
2004-10-01	171.000
2005-01-01	163.005
2005-04-01	161.414
2005-07-01	163.711
2005-10-01	164.462
2006-01-01	177.309
2006-04-01	188.645
2006-07-01	182.732
2006-10-01	207.966
2007-01-01	218.966
2007-04-01	239.322
2007-07-01	257.753
2007-10-01	276.253
2008-01-01	298.593
2008-04-01	320.645
2008-07-01	290.267
2008-10-01	310.491
2009-01-01	310.707
2009-04-01	353.009
2009-07-01	371.623
2009-10-01	372.693
2010-01-01	377.218
2010-04-01	365.016
2010-07-01	409.881
2010-10-01	399.835
2011-01-01	416.415
2011-04-01	423.610
2011-07-01	384.610
2011-10-01	357.457
2012-01-01	352.215
2012-04-01	333.979
2012-07-01	341.947
2012-10-01	344.147
2013-01-01	314.817
2013-04-01	312.003
2013-07-01	331.599
2013-10-01	372.255
2014-01-01	337.817
2014-04-01	321.798
2014-07-01	302.109
2014-10-01	296.155
2015-01-01	276.116
2015-04-01	287.726