Quarter	Billions of US Dollars
1967-04-01	0.0250
1968-04-01	0.0300
1968-10-01	0.0200
1969-10-01	0.0500
1970-01-01	0.0274
1971-01-01	0.0556
1971-04-01	0.0700
1972-10-01	0.0500
1975-01-01	0.0099
1975-04-01	0.0098
1977-01-01	0.0276
1977-04-01	0.0869
1977-10-01	0.0750
1978-01-01	0.0262
1978-04-01	0.1102
1979-01-01	0.0358
1979-04-01	0.0500
1979-07-01	0.1000
1979-10-01	0.0364
1980-01-01	0.2000
1980-04-01	0.3422
1980-07-01	0.2786
1980-10-01	0.1438
1981-01-01	0.2500
1981-04-01	-0.0017
1981-10-01	0.5077
1982-01-01	0.8220
1982-04-01	0.1082
1982-07-01	0.1000
1982-10-01	0.5501
1983-01-01	0.1273
1983-04-01	0.0984
1983-07-01	0.1641
1983-10-01	0.8500
1984-01-01	0.3345
1984-04-01	0.1237
1984-07-01	0.6015
1984-10-01	1.2494
1985-01-01	1.0503
1985-04-01	1.6071
1985-07-01	0.8300
1985-10-01	0.6650
1986-01-01	-0.2603
1986-04-01	1.2884
1986-07-01	0.8143
1986-10-01	-0.0319
1987-01-01	0.0321
1987-04-01	0.3561
1987-07-01	0.1399
1987-10-01	3.2341
1988-01-01	0.3579
1988-04-01	0.7172
1988-07-01	0.9082
1988-10-01	-0.3787
1989-01-01	-0.3126
1989-04-01	0.4204
1989-07-01	0.5293
1989-10-01	-0.0334
1990-01-01	0.0164
1990-04-01	2.7140
1990-07-01	1.7911
1990-10-01	0.8306
1991-01-01	5.9906
1991-04-01	-0.6328
1991-07-01	0.2246
1991-10-01	0.0466
1992-01-01	1.4075
1992-04-01	1.1233
1992-07-01	-0.4689
1992-10-01	-0.4502
1993-01-01	2.2356
1993-04-01	1.2437
1993-07-01	6.0589
1993-10-01	0.1823
1994-01-01	2.4221
1994-04-01	-0.2481
1994-07-01	3.6350
1994-10-01	3.1267
1995-01-01	0.0028
1995-04-01	6.0570
1995-07-01	1.2089
1995-10-01	0.3763
1996-01-01	-0.6431
1996-04-01	2.9428
1996-07-01	1.1038
1996-10-01	0.8445
1997-01-01	1.3983
1997-04-01	2.4946
1997-07-01	2.2416
1997-10-01	-0.6573
1998-01-01	0.9929
1998-04-01	4.0428
1998-07-01	0.1463
1998-10-01	4.2637
1999-01-01	-1.9294
1999-04-01	8.3970
1999-07-01	0.1147
1999-10-01	12.7023
2000-01-01	10.5003
2000-04-01	12.2744
2000-07-01	12.5365
2000-10-01	9.1338
2001-01-01	10.9422
2001-04-01	9.5261
2001-07-01	5.3843
2001-10-01	20.2102
2002-01-01	9.8436
2002-04-01	3.9274
2002-07-01	8.4227
2002-10-01	16.1064
2003-01-01	20.6536
2003-04-01	8.1010
2003-07-01	9.1478
2003-10-01	18.3516
2004-01-01	29.0731
2004-04-01	30.7088
2004-07-01	10.8791
2004-10-01	26.8020
2005-01-01	24.8120
2005-04-01	29.8267
2005-07-01	-10.5865
2005-10-01	27.0103
2006-01-01	25.7876
2006-04-01	21.2577
2006-07-01	24.5409
2006-10-01	26.2460
2007-01-01	28.0250
2007-04-01	50.6409
2007-07-01	-6.4253
2007-10-01	9.0415
2008-01-01	19.6048
2008-04-01	35.6016
2008-07-01	-2.1621
2008-10-01	73.4355
2009-01-01	32.5164
2009-04-01	13.5072
2009-07-01	22.9292
2009-10-01	33.7223
2010-01-01	0.0394
2010-04-01	-3.0676
2010-07-01	28.2704
2010-10-01	18.4821
2011-01-01	15.9645
2011-04-01	9.2725
2011-07-01	2.7616
2011-10-01	7.0558
2012-01-01	-32.4856
2012-04-01	-24.3561
2012-07-01	-0.2663
2012-10-01	-5.5834
2013-01-01	-18.2656
2013-04-01	0.9918
2013-07-01	17.9374
2013-10-01	17.5348
2014-01-01	-7.9403
2014-04-01	4.4673
2014-07-01	-21.7017
2014-10-01	2.7731
2015-01-01	3.3863
2015-04-01	-2.3045