Quarter	Billions of US Dollars
1966-01-01	0.080
1966-04-01	0.030
1966-07-01	0.015
1967-01-01	0.014
1967-04-01	0.105
1967-10-01	0.022
1968-01-01	0.299
1968-04-01	0.495
1968-07-01	0.170
1968-10-01	0.091
1969-01-01	0.227
1969-04-01	0.030
1969-07-01	0.030
1969-10-01	0.158
1970-01-01	0.027
1970-04-01	0.015
1970-07-01	0.075
1970-10-01	0.035
1971-01-01	0.826
1971-04-01	0.296
1971-07-01	0.238
1971-10-01	0.620
1972-01-01	1.569
1972-04-01	2.024
1972-07-01	1.614
1972-10-01	2.006
1973-01-01	1.796
1973-04-01	1.242
1973-07-01	1.041
1973-10-01	1.494
1974-01-01	0.971
1974-04-01	1.185
1974-07-01	1.377
1974-10-01	2.104
1975-01-01	3.485
1975-04-01	4.352
1975-07-01	3.086
1975-10-01	4.862
1976-01-01	7.114
1976-04-01	5.441
1976-07-01	4.629
1976-10-01	6.391
1977-01-01	5.856
1977-04-01	6.201
1977-07-01	5.028
1977-10-01	5.780
1978-01-01	6.357
1978-04-01	6.925
1978-07-01	4.611
1978-10-01	4.465
1979-01-01	7.718
1979-04-01	6.352
1979-07-01	5.398
1979-10-01	4.553
1980-01-01	4.198
1980-04-01	7.221
1980-07-01	4.457
1980-10-01	6.007
1981-01-01	5.165
1981-04-01	6.023
1981-07-01	6.885
1981-10-01	10.610
1982-01-01	14.386
1982-04-01	11.988
1982-07-01	12.074
1982-10-01	10.881
1983-01-01	13.750
1983-04-01	9.768
1983-07-01	5.381
1983-10-01	14.415
1984-01-01	17.795
1984-04-01	12.137
1984-07-01	17.695
1984-10-01	23.909
1985-01-01	20.303
1985-04-01	19.122
1985-07-01	21.571
1985-10-01	17.838
1986-01-01	24.766
1986-04-01	37.972
1986-07-01	36.649
1986-10-01	27.647
1987-01-01	27.152
1987-04-01	27.975
1987-07-01	21.858
1987-10-01	8.698
1988-01-01	19.616
1988-04-01	32.433
1988-07-01	36.519
1988-10-01	22.181
1989-01-01	42.227
1989-04-01	40.908
1989-07-01	28.300
1989-10-01	33.808
1990-01-01	26.256
1990-04-01	10.758
1990-07-01	34.294
1990-10-01	25.536
1991-01-01	36.153
1991-04-01	35.784
1991-07-01	29.605
1991-10-01	27.275
1992-01-01	17.488
1992-04-01	23.770
1992-07-01	8.276
1992-10-01	31.333
1993-01-01	20.787
1993-04-01	3.176
1993-07-01	37.069
1993-10-01	34.450
1994-01-01	54.473
1994-04-01	26.644
1994-07-01	56.463
1994-10-01	41.361
1995-01-01	44.819
1995-04-01	44.265
1995-07-01	52.753
1995-10-01	49.740
1996-01-01	75.972
1996-04-01	73.159
1996-07-01	80.250
1996-10-01	101.760
1997-01-01	95.785
1997-04-01	86.302
1997-07-01	96.471
1997-10-01	31.712
1998-01-01	108.401
1998-04-01	140.911
1998-07-01	79.264
1998-10-01	48.776
1999-01-01	153.072
1999-04-01	219.558
1999-07-01	190.356
1999-10-01	110.363
2000-01-01	152.768
2000-04-01	184.077
2000-07-01	189.109
2000-10-01	212.977
2001-01-01	337.540
2001-04-01	303.774
2001-07-01	176.292
2001-10-01	274.689
2002-01-01	219.224
2002-04-01	247.814
2002-07-01	90.631
2002-10-01	134.447
2003-01-01	211.131
2003-04-01	250.012
2003-07-01	247.332
2003-10-01	300.490
2004-01-01	304.622
2004-04-01	233.151
2004-07-01	244.785
2004-10-01	300.516
2005-01-01	308.471
2005-04-01	344.147
2005-07-01	138.972
2005-10-01	445.305
2006-01-01	402.819
2006-04-01	440.758
2006-07-01	429.053
2006-10-01	658.443
2007-01-01	590.539
2007-04-01	767.088
2007-07-01	258.481
2007-10-01	271.527
2008-01-01	152.208
2008-04-01	690.373
2008-07-01	196.000
2008-10-01	461.546
2009-01-01	336.717
2009-04-01	473.324
2009-07-01	225.314
2009-10-01	220.528
2010-01-01	221.509
2010-04-01	-41.816
2010-07-01	147.482
2010-10-01	22.921
2011-01-01	99.820
2011-04-01	38.035
2011-07-01	-65.121
2011-10-01	-3.429
2012-01-01	73.601
2012-04-01	-148.587
2012-07-01	-4.736
2012-10-01	108.034
2013-01-01	-74.692
2013-04-01	-51.778
2013-07-01	12.152
2013-10-01	136.200
2014-01-01	-69.193
2014-04-01	124.841
2014-07-01	83.764
2014-10-01	-11.473
2015-01-01	98.476
2015-04-01	123.798