Quarter	Billions of US Dollars
1971-01-01	0.030
1971-04-01	0.064
1971-07-01	0.065
1971-10-01	0.090
1972-01-01	0.166
1972-04-01	0.198
1972-07-01	0.298
1972-10-01	0.341
1973-01-01	0.364
1973-04-01	0.384
1973-07-01	0.388
1973-10-01	0.370
1974-01-01	0.380
1974-04-01	0.394
1974-07-01	0.458
1974-10-01	0.507
1975-01-01	0.724
1975-04-01	0.994
1975-07-01	0.944
1975-10-01	1.039
1976-01-01	1.145
1976-04-01	1.380
1976-07-01	1.809
1976-10-01	2.099
1977-01-01	2.158
1977-04-01	2.235
1977-07-01	2.690
1977-10-01	3.139
1978-01-01	3.792
1978-04-01	4.045
1978-07-01	4.566
1978-10-01	4.849
1979-01-01	5.029
1979-04-01	5.083
1979-07-01	5.196
1979-10-01	5.311
1980-01-01	5.261
1980-04-01	5.464
1980-07-01	5.464
1980-10-01	5.383
1981-01-01	5.304
1981-04-01	5.135
1981-07-01	5.242
1981-10-01	5.704
1982-01-01	5.526
1982-04-01	5.562
1982-07-01	6.277
1982-10-01	6.851
1983-01-01	6.963
1983-04-01	6.969
1983-07-01	7.426
1983-10-01	8.071
1984-01-01	8.906
1984-04-01	9.376
1984-07-01	9.617
1984-10-01	10.219
1985-01-01	10.992
1985-04-01	12.111
1985-07-01	14.410
1985-10-01	16.131
1986-01-01	18.876
1986-04-01	21.008
1986-07-01	22.769
1986-10-01	25.592
1987-01-01	27.977
1987-04-01	29.445
1987-07-01	30.789
1987-10-01	33.679
1988-01-01	33.746
1988-04-01	33.783
1988-07-01	34.468
1988-10-01	38.468
1989-01-01	40.208
1989-04-01	39.445
1989-07-01	41.787
1989-10-01	41.791
1990-01-01	41.596
1990-04-01	43.421
1990-07-01	47.084
1990-10-01	47.204
1991-01-01	45.936
1991-04-01	44.089
1991-07-01	46.588
1991-10-01	46.877
1992-01-01	45.310
1992-04-01	44.957
1992-07-01	45.248
1992-10-01	42.277
1993-01-01	41.853
1993-04-01	42.434
1993-07-01	40.759
1993-10-01	41.403
1994-01-01	43.583
1994-04-01	46.656
1994-07-01	50.600
1994-10-01	54.450
1995-01-01	57.513
1995-04-01	56.850
1995-07-01	58.191
1995-10-01	59.577
1996-01-01	60.786
1996-04-01	63.096
1996-07-01	65.437
1996-10-01	68.635
1997-01-01	69.649
1997-04-01	72.523
1997-07-01	69.563
1997-10-01	65.054
1998-01-01	65.006
1998-04-01	65.953
1998-07-01	66.230
1998-10-01	67.534
1999-01-01	68.855
1999-04-01	70.768
1999-07-01	75.688
1999-10-01	76.312
2000-01-01	77.952
2000-04-01	85.167
2000-07-01	84.035
2000-10-01	83.144
2001-01-01	82.585
2001-04-01	89.401
2001-07-01	94.144
2001-10-01	93.850
2002-01-01	94.763
2002-04-01	100.930
2002-07-01	103.476
2002-10-01	109.629
2003-01-01	113.977
2003-04-01	126.409
2003-07-01	138.793
2003-10-01	150.434
2004-01-01	166.083
2004-04-01	174.317
2004-07-01	194.540
2004-10-01	212.526
2005-01-01	222.958
2005-04-01	231.997
2005-07-01	232.379
2005-10-01	242.771
2006-01-01	263.939
2006-04-01	282.058
2006-07-01	296.430
2006-10-01	328.651
2007-01-01	352.192
2007-04-01	375.068
2007-07-01	398.824
2007-10-01	405.880
2008-01-01	443.035
2008-04-01	444.959
2008-07-01	422.504
2008-10-01	415.574
2009-01-01	397.178
2009-04-01	432.618
2009-07-01	457.074
2009-10-01	491.632
2010-01-01	500.036
2010-04-01	484.127
2010-07-01	523.013
2010-10-01	528.306
2011-01-01	537.704
2011-04-01	554.560
2011-07-01	537.562
2011-10-01	530.037
2012-01-01	551.642
2012-04-01	538.295
2012-07-01	582.229
2012-10-01	570.634
2013-01-01	572.733
2013-04-01	571.778
2013-07-01	584.555
2013-10-01	601.187
2014-01-01	610.886
2014-04-01	620.185
2014-07-01	600.347
2014-10-01	592.501
2015-01-01	578.368
2015-04-01	599.138