Quarter	Billions of US Dollars
1971-01-01	0.0250
1972-10-01	0.0300
1973-01-01	0.0522
1973-04-01	0.0200
1973-07-01	0.0719
1974-01-01	0.0234
1974-04-01	0.0587
1974-07-01	0.0157
1974-10-01	0.0364
1975-04-01	0.0344
1975-10-01	0.0384
1976-07-01	0.0202
1977-01-01	0.0300
1977-07-01	0.0566
1978-04-01	0.0833
1979-04-01	0.0393
1979-07-01	0.0126
1979-10-01	0.0665
1980-01-01	0.1163
1980-07-01	0.0116
1980-10-01	0.0950
1981-01-01	0.1000
1981-04-01	0.1000
1981-07-01	-0.0715
1981-10-01	0.3420
1982-01-01	0.3000
1982-04-01	0.1033
1982-07-01	0.1645
1982-10-01	0.0499
1983-01-01	0.2416
1983-04-01	0.0896
1983-07-01	0.0336
1983-10-01	0.6496
1984-01-01	0.0368
1984-04-01	0.0593
1984-07-01	0.3490
1984-10-01	0.2579
1985-01-01	0.3982
1985-04-01	0.1996
1985-07-01	0.2421
1985-10-01	0.3956
1986-01-01	0.1976
1986-04-01	0.5292
1986-07-01	1.0083
1986-10-01	-0.0031
1987-01-01	-0.2017
1987-04-01	0.1894
1987-07-01	-0.0992
1987-10-01	-0.3450
1988-01-01	0.2327
1988-04-01	0.1995
1988-07-01	-0.3552
1988-10-01	-0.0895
1989-01-01	-0.0678
1989-04-01	0.2498
1989-07-01	1.7723
1989-10-01	-0.0536
1990-01-01	0.2782
1990-04-01	0.2491
1990-07-01	-0.2383
1990-10-01	0.0370
1991-01-01	0.0281
1991-04-01	0.5577
1991-07-01	0.0052
1991-10-01	-0.0562
1992-01-01	0.1737
1992-04-01	-0.2612
1992-07-01	0.3720
1992-10-01	0.9733
1993-01-01	1.5963
1993-04-01	-0.1390
1993-07-01	0.0064
1993-10-01	-0.0844
1994-01-01	-0.5936
1994-04-01	0.3657
1994-07-01	-0.2962
1994-10-01	-0.5884
1995-01-01	0.2148
1995-04-01	0.5763
1995-07-01	0.2795
1995-10-01	0.9379
1996-01-01	3.0124
1996-04-01	0.0360
1996-07-01	0.5857
1996-10-01	0.8681
1997-01-01	0.6704
1997-04-01	0.1528
1997-07-01	0.5844
1997-10-01	-0.5440
1998-01-01	0.9283
1998-04-01	0.5865
1998-07-01	0.6839
1998-10-01	-0.1241
1999-01-01	0.1698
1999-04-01	0.0366
1999-07-01	1.2748
1999-10-01	1.1723
2000-01-01	1.6340
2000-04-01	0.7536
2000-07-01	0.8021
2000-10-01	-0.0345
2001-01-01	4.6406
2001-04-01	1.5948
2001-07-01	0.1381
2001-10-01	0.8018
2002-01-01	0.2369
2002-04-01	0.6298
2002-07-01	1.3348
2002-10-01	2.2366
2003-01-01	1.8322
2003-04-01	3.5123
2003-07-01	7.0187
2003-10-01	4.8188
2004-01-01	4.5163
2004-04-01	2.0769
2004-07-01	6.5985
2004-10-01	6.7733
2005-01-01	3.6272
2005-04-01	13.3544
2005-07-01	8.0507
2005-10-01	13.3036
2006-01-01	6.0626
2006-04-01	15.4012
2006-07-01	17.2828
2006-10-01	17.6679
2007-01-01	32.8417
2007-04-01	33.9942
2007-07-01	34.8738
2007-10-01	26.4776
2008-01-01	8.8580
2008-04-01	31.7529
2008-07-01	0.8546
2008-10-01	33.3888
2009-01-01	16.3678
2009-04-01	22.6989
2009-07-01	16.5844
2009-10-01	10.6189
2010-01-01	25.7764
2010-04-01	-1.6375
2010-07-01	-37.8440
2010-10-01	2.7489
2011-01-01	-8.2712
2011-04-01	-4.3653
2011-07-01	-14.4093
2011-10-01	0.7036
2012-01-01	-9.6247
2012-04-01	-7.6839
2012-07-01	-13.2062
2012-10-01	5.6292
2013-01-01	7.7998
2013-04-01	-12.2756
2013-07-01	-0.3783
2013-10-01	11.0569
2014-01-01	1.8415
2014-04-01	-4.9881
2014-07-01	-4.6274
2014-10-01	-28.4540
2015-01-01	-26.7550
2015-04-01	14.2938