Quarter	Billions of US Dollars
1972-04-01	0.03150
1972-10-01	0.02000
1973-10-01	0.03000
1975-04-01	0.01200
1975-10-01	0.01920
1976-04-01	0.02500
1976-07-01	0.06000
1976-10-01	0.07090
1977-01-01	0.06190
1977-07-01	0.03040
1977-10-01	0.06220
1978-01-01	0.02500
1979-01-01	0.02500
1981-01-01	0.07500
1981-07-01	-0.03000
1981-10-01	-0.02500
1982-04-01	-0.00405
1982-07-01	0.05843
1982-10-01	-0.01999
1983-01-01	-0.06653
1983-04-01	-0.02500
1983-10-01	0.05800
1984-07-01	-0.01500
1985-01-01	0.00390
1985-04-01	-0.02500
1985-10-01	0.04153
1986-01-01	-0.08571
1986-04-01	0.03600
1986-10-01	0.15514
1987-01-01	0.05000
1987-04-01	0.10190
1987-10-01	0.07300
1988-04-01	0.07970
1988-07-01	0.15280
1988-10-01	0.10738
1989-01-01	0.06911
1989-04-01	0.18380
1989-07-01	0.46371
1989-10-01	-0.18270
1990-01-01	0.13732
1990-04-01	-0.09072
1990-10-01	-0.06460
1991-01-01	-0.02979
1991-04-01	-0.06704
1991-07-01	-0.05494
1991-10-01	-0.06610
1992-01-01	-0.06788
1992-04-01	-0.08792
1992-10-01	-0.07500
1993-01-01	-0.10329
1993-04-01	-0.04000
1994-01-01	0.02825
1994-04-01	-0.02264
1994-07-01	-0.23757
1994-10-01	0.10000
1995-01-01	-0.02500
1995-07-01	0.04000
1995-10-01	0.02971
1996-01-01	0.00858
1996-04-01	0.50218
1996-07-01	-0.21326
1996-10-01	0.21193
1997-01-01	0.08100
1997-04-01	0.27908
1997-07-01	0.94382
1997-10-01	0.00267
1998-01-01	-0.01171
1998-04-01	1.45875
1998-07-01	0.07863
1998-10-01	-0.01293
1999-01-01	0.97257
1999-04-01	0.07516
1999-07-01	0.68096
1999-10-01	0.31424
2000-01-01	0.05418
2000-04-01	1.61474
2000-07-01	0.31183
2000-10-01	-0.00489
2001-01-01	-0.21956
2001-04-01	0.88326
2001-07-01	2.09560
2001-10-01	3.87752
2002-01-01	0.43058
2002-04-01	-0.31977
2002-07-01	-0.15599
2002-10-01	0.32758
2003-01-01	0.49811
2003-04-01	0.68648
2003-07-01	1.36362
2003-10-01	3.45295
2004-01-01	0.36151
2004-04-01	2.18540
2004-07-01	2.26478
2004-10-01	2.90673
2005-01-01	0.97864
2005-04-01	0.94363
2005-07-01	2.21762
2005-10-01	1.78340
2006-01-01	0.18811
2006-04-01	3.51656
2006-07-01	1.10266
2006-10-01	1.28132
2007-01-01	2.47441
2007-04-01	4.03180
2007-07-01	0.45152
2007-10-01	0.59851
2008-01-01	-0.21612
2008-04-01	-0.05234
2008-07-01	0.77668
2008-10-01	-1.48502
2009-01-01	-2.42741
2009-04-01	-2.65987
2009-07-01	1.04080
2009-10-01	2.08402
2010-01-01	0.01409
2010-04-01	0.34542
2010-07-01	2.54956
2010-10-01	0.28388
2011-01-01	2.52331
2011-04-01	1.16769
2011-07-01	-2.11580
2011-10-01	-0.53014
2012-01-01	9.24467
2012-04-01	-0.56831
2012-07-01	8.35433
2012-10-01	5.04590
2013-01-01	2.65354
2013-04-01	1.48980
2013-07-01	0.23107
2013-10-01	0.05730
2014-01-01	2.47548
2014-04-01	2.85608
2014-07-01	7.75334
2014-10-01	-2.56171
2015-01-01	1.75316
2015-04-01	4.46647