Quarter	Billions of US Dollars
1966-01-01	0.0150
1966-04-01	0.0200
1971-01-01	0.0120
1971-04-01	0.0153
1972-04-01	0.0735
1973-01-01	0.0307
1973-04-01	0.0200
1973-07-01	0.0162
1974-04-01	0.0500
1975-01-01	0.0243
1975-04-01	0.0170
1975-07-01	0.0485
1976-01-01	0.1080
1976-10-01	0.0826
1977-01-01	0.1464
1977-04-01	0.5476
1977-07-01	0.0330
1978-01-01	0.1480
1978-04-01	0.0480
1978-07-01	0.2870
1979-04-01	0.0991
1979-07-01	0.1046
1980-01-01	0.0673
1980-04-01	0.1120
1980-07-01	0.0337
1980-10-01	0.0557
1981-01-01	0.0500
1981-04-01	0.0386
1981-07-01	0.0233
1981-10-01	0.0433
1982-01-01	0.1817
1982-04-01	0.0362
1982-07-01	0.0104
1982-10-01	0.0359
1983-01-01	0.0208
1983-04-01	0.4186
1983-07-01	0.0780
1983-10-01	0.2803
1984-01-01	0.0160
1984-04-01	0.0535
1984-07-01	0.0098
1984-10-01	0.0379
1985-01-01	0.0518
1985-04-01	0.2072
1985-07-01	0.0729
1985-10-01	0.1985
1986-01-01	0.3089
1986-04-01	0.4499
1986-07-01	0.1155
1986-10-01	0.2589
1987-01-01	0.3722
1987-04-01	0.3880
1987-07-01	0.4472
1987-10-01	0.1366
1988-01-01	1.1928
1988-04-01	0.7744
1988-07-01	0.9629
1988-10-01	1.0927
1989-01-01	0.8222
1989-04-01	0.4938
1989-07-01	0.6134
1989-10-01	0.3846
1990-01-01	0.5356
1990-04-01	0.3687
1990-07-01	0.8888
1990-10-01	0.7991
1991-01-01	2.1738
1991-04-01	0.5576
1991-07-01	0.3094
1991-10-01	0.8626
1992-01-01	1.5828
1992-04-01	0.5626
1992-07-01	0.3139
1992-10-01	0.8071
1993-01-01	1.0008
1993-04-01	0.6888
1993-07-01	1.4747
1993-10-01	2.1760
1994-01-01	1.6254
1994-04-01	1.6485
1994-07-01	1.8904
1994-10-01	3.0264
1995-01-01	3.2753
1995-04-01	2.3158
1995-07-01	2.9818
1995-10-01	2.2522
1996-01-01	1.7778
1996-04-01	4.1493
1996-07-01	2.1836
1996-10-01	1.4779
1997-01-01	2.0357
1997-04-01	2.5658
1997-07-01	2.2040
1997-10-01	1.6840
1998-01-01	2.6592
1998-04-01	5.1499
1998-07-01	1.5929
1998-10-01	2.7949
1999-01-01	3.6822
1999-04-01	5.4592
1999-07-01	4.2725
1999-10-01	3.1956
2000-01-01	3.2552
2000-04-01	4.2082
2000-07-01	3.5211
2000-10-01	6.7907
2001-01-01	14.0935
2001-04-01	11.8936
2001-07-01	4.4448
2001-10-01	12.4449
2002-01-01	7.3118
2002-04-01	7.1214
2002-07-01	4.3614
2002-10-01	6.2370
2003-01-01	10.2205
2003-04-01	10.4477
2003-07-01	11.3216
2003-10-01	20.4717
2004-01-01	10.4379
2004-04-01	15.4431
2004-07-01	9.1218
2004-10-01	17.0508
2005-01-01	18.3169
2005-04-01	32.2533
2005-07-01	32.3022
2005-10-01	21.1651
2006-01-01	23.0391
2006-04-01	22.4379
2006-07-01	29.5206
2006-10-01	31.4252
2007-01-01	26.2226
2007-04-01	27.1549
2007-07-01	24.4790
2007-10-01	33.1642
2008-01-01	13.5992
2008-04-01	28.6880
2008-07-01	13.2024
2008-10-01	19.4595
2009-01-01	14.6008
2009-04-01	25.8476
2009-07-01	38.4034
2009-10-01	20.1498
2010-01-01	16.8164
2010-04-01	12.0263
2010-07-01	11.1663
2010-10-01	20.2254
2011-01-01	22.7550
2011-04-01	17.6232
2011-07-01	18.9734
2011-10-01	9.8891
2012-01-01	26.4245
2012-04-01	15.6809
2012-07-01	27.2787
2012-10-01	30.4519
2013-01-01	35.7876
2013-04-01	32.4121
2013-07-01	22.3603
2013-10-01	34.4934
2014-01-01	29.3418
2014-04-01	42.2729
2014-07-01	28.0790
2014-10-01	23.7243
2015-01-01	51.5830
2015-04-01	32.1637