Quarter	Billions of US Dollars
1971-01-01	0.04500
1971-07-01	0.02000
1972-01-01	0.08150
1972-04-01	0.04090
1972-07-01	0.02000
1972-10-01	0.04130
1973-01-01	0.01210
1973-07-01	0.08000
1973-10-01	0.03880
1974-01-01	0.05000
1975-01-01	0.02160
1975-04-01	0.02500
1976-10-01	0.04190
1977-01-01	0.13500
1977-04-01	0.12770
1977-07-01	0.10000
1979-04-01	0.01470
1980-07-01	0.04000
1982-01-01	-0.02131
1983-10-01	0.05000
1985-04-01	-0.06357
1985-07-01	-0.05000
1985-10-01	-0.31459
1986-01-01	0.07000
1986-04-01	-0.01339
1986-07-01	0.00950
1986-10-01	-0.04736
1987-01-01	-0.01805
1987-04-01	0.36186
1987-07-01	0.03070
1987-10-01	-0.00531
1988-01-01	-0.02423
1988-07-01	0.10000
1988-10-01	0.07680
1989-01-01	0.08554
1989-04-01	0.06000
1989-07-01	0.09000
1989-10-01	0.07500
1990-01-01	-0.00300
1990-07-01	-0.10000
1990-10-01	-0.02199
1991-07-01	-0.10000
1992-01-01	-0.00200
1992-04-01	-0.07475
1992-07-01	0.20000
1992-10-01	0.10000
1993-01-01	0.15000
1993-04-01	0.00530
1993-10-01	0.37500
1994-01-01	1.19570
1994-04-01	-0.06000
1994-07-01	0.05430
1994-10-01	0.17500
1995-01-01	0.20000
1995-04-01	-0.07162
1995-07-01	0.54938
1995-10-01	2.05411
1996-01-01	0.26924
1996-04-01	0.57449
1996-07-01	1.56004
1996-10-01	1.61731
1997-01-01	0.66161
1997-04-01	-0.03112
1997-07-01	0.44814
1997-10-01	-0.07464
1998-01-01	2.45853
1998-04-01	1.62976
1998-07-01	2.42134
1998-10-01	0.17040
1999-01-01	0.07975
1999-04-01	-0.01581
1999-07-01	0.46306
1999-10-01	-0.33221
2000-01-01	0.59675
2000-04-01	1.63371
2000-07-01	-1.06670
2000-10-01	3.22965
2001-01-01	0.80879
2001-04-01	0.79022
2001-07-01	0.75885
2001-10-01	-0.47880
2002-01-01	-1.64480
2002-04-01	1.51304
2002-07-01	-0.53125
2002-10-01	-1.19137
2003-01-01	-0.71107
2003-04-01	-0.26204
2003-07-01	-0.95017
2003-10-01	3.86793
2004-01-01	-0.65701
2004-04-01	0.16848
2004-07-01	0.78367
2004-10-01	0.26113
2005-01-01	3.45813
2005-04-01	0.48226
2005-07-01	-0.08820
2005-10-01	1.00566
2006-01-01	-0.27097
2006-04-01	1.83672
2006-07-01	3.25747
2006-10-01	-1.77415
2007-01-01	2.78067
2007-04-01	4.67765
2007-07-01	-0.17853
2007-10-01	-1.11805
2008-01-01	0.99166
2008-04-01	6.29004
2008-07-01	2.58004
2008-10-01	-0.87825
2009-01-01	6.94302
2009-04-01	2.98520
2009-07-01	1.43552
2009-10-01	3.20602
2010-01-01	1.71297
2010-04-01	-0.29315
2010-07-01	4.93713
2010-10-01	4.12572
2011-01-01	1.97787
2011-04-01	3.60902
2011-07-01	-0.35838
2011-10-01	0.35093
2012-01-01	-1.67223
2012-04-01	3.75050
2012-07-01	2.42837
2012-10-01	1.21503
2013-01-01	1.47012
2013-04-01	4.71862
2013-07-01	3.05689
2013-10-01	0.10636
2014-01-01	2.26485
2014-04-01	-1.08392
2014-07-01	-0.38800
2014-10-01	2.97805
2015-01-01	0.33631
2015-04-01	0.67272