Quarter	Billions of US Dollars
1966-07-01	0.015
1966-10-01	0.015
1967-01-01	0.029
1967-04-01	0.029
1967-07-01	0.029
1967-10-01	0.029
1968-01-01	0.029
1968-04-01	0.029
1968-07-01	0.029
1968-10-01	0.029
1969-01-01	0.029
1969-04-01	0.029
1969-07-01	0.029
1969-10-01	0.030
1970-01-01	0.030
1970-04-01	0.030
1970-07-01	0.030
1970-10-01	0.030
1971-01-01	0.030
1971-04-01	0.031
1971-07-01	0.032
1971-10-01	0.032
1972-01-01	0.032
1972-04-01	0.066
1972-07-01	0.086
1972-10-01	0.142
1973-01-01	0.198
1973-04-01	0.273
1973-07-01	0.305
1973-10-01	0.341
1974-01-01	0.418
1974-04-01	0.464
1974-07-01	0.620
1974-10-01	1.057
1975-01-01	1.468
1975-04-01	1.723
1975-07-01	1.690
1975-10-01	1.776
1976-01-01	1.901
1976-04-01	2.013
1976-07-01	2.186
1976-10-01	2.540
1977-01-01	2.804
1977-04-01	3.196
1977-07-01	3.743
1977-10-01	4.374
1978-01-01	4.859
1978-04-01	5.188
1978-07-01	6.201
1978-10-01	6.503
1979-01-01	6.610
1979-04-01	6.959
1979-07-01	7.650
1979-10-01	7.681
1980-01-01	7.033
1980-04-01	8.196
1980-07-01	8.476
1980-10-01	8.256
1981-01-01	7.998
1981-04-01	7.745
1981-07-01	8.138
1981-10-01	9.052
1982-01-01	8.952
1982-04-01	8.783
1982-07-01	8.767
1982-10-01	9.415
1983-01-01	9.441
1983-04-01	9.630
1983-07-01	9.685
1983-10-01	9.559
1984-01-01	10.320
1984-04-01	10.176
1984-07-01	10.039
1984-10-01	10.030
1985-01-01	10.247
1985-04-01	10.765
1985-07-01	12.247
1985-10-01	12.624
1986-01-01	14.001
1986-04-01	15.645
1986-07-01	17.202
1986-10-01	17.565
1987-01-01	19.705
1987-04-01	20.101
1987-07-01	20.040
1987-10-01	23.438
1988-01-01	24.952
1988-04-01	24.274
1988-07-01	24.133
1988-10-01	25.720
1989-01-01	25.781
1989-04-01	25.396
1989-07-01	26.239
1989-10-01	27.927
1990-01-01	28.716
1990-04-01	30.210
1990-07-01	32.346
1990-10-01	33.483
1991-01-01	32.192
1991-04-01	31.064
1991-07-01	33.348
1991-10-01	36.216
1992-01-01	34.990
1992-04-01	38.221
1992-07-01	40.698
1992-10-01	37.036
1993-01-01	38.227
1993-04-01	39.565
1993-07-01	41.591
1993-10-01	41.217
1994-01-01	44.765
1994-04-01	46.773
1994-07-01	47.904
1994-10-01	49.740
1995-01-01	58.549
1995-04-01	59.768
1995-07-01	57.900
1995-10-01	58.525
1996-01-01	60.516
1996-04-01	60.736
1996-07-01	61.176
1996-10-01	59.592
1997-01-01	58.502
1997-04-01	59.407
1997-07-01	60.488
1997-10-01	59.172
1998-01-01	60.920
1998-04-01	62.501
1998-07-01	67.353
1998-10-01	71.585
1999-01-01	71.266
1999-04-01	73.184
1999-07-01	74.927
1999-10-01	73.139
2000-01-01	74.894
2000-04-01	78.849
2000-07-01	78.070
2000-10-01	80.804
2001-01-01	83.271
2001-04-01	82.588
2001-07-01	89.794
2001-10-01	94.293
2002-01-01	103.146
2002-04-01	118.801
2002-07-01	118.273
2002-10-01	125.329
2003-01-01	132.201
2003-04-01	146.934
2003-07-01	155.360
2003-10-01	168.124
2004-01-01	175.115
2004-04-01	179.008
2004-07-01	183.637
2004-10-01	200.596
2005-01-01	206.205
2005-04-01	206.244
2005-07-01	204.642
2005-10-01	205.863
2006-01-01	216.184
2006-04-01	235.739
2006-07-01	239.666
2006-10-01	259.378
2007-01-01	287.306
2007-04-01	293.722
2007-07-01	312.090
2007-10-01	328.376
2008-01-01	362.274
2008-04-01	360.152
2008-07-01	331.894
2008-10-01	333.655
2009-01-01	330.744
2009-04-01	356.927
2009-07-01	375.972
2009-10-01	366.850
2010-01-01	347.966
2010-04-01	320.420
2010-07-01	349.646
2010-10-01	341.474
2011-01-01	359.254
2011-04-01	364.268
2011-07-01	343.760
2011-10-01	324.857
2012-01-01	323.768
2012-04-01	306.259
2012-07-01	312.280
2012-10-01	315.493
2013-01-01	301.131
2013-04-01	314.514
2013-07-01	323.439
2013-10-01	325.945
2014-01-01	307.673
2014-04-01	308.030
2014-07-01	281.310
2014-10-01	274.993
2015-01-01	247.576
2015-04-01	254.080