Quarter	Billions of US Dollars
1973-01-01	0.00980
1976-07-01	0.10000
1977-04-01	0.03010
1978-07-01	0.03000
1980-04-01	-0.04454
1980-07-01	0.05320
1982-10-01	0.10000
1983-01-01	0.14274
1983-04-01	0.15000
1983-07-01	-0.00931
1983-10-01	0.02000
1984-07-01	0.04000
1984-10-01	0.01500
1985-10-01	-0.08700
1986-04-01	0.05220
1986-07-01	0.02830
1986-10-01	0.15390
1987-01-01	0.09340
1987-04-01	0.29720
1987-07-01	0.03170
1988-01-01	-0.00070
1988-07-01	0.08060
1988-10-01	0.04000
1989-01-01	0.11660
1989-07-01	-0.01020
1989-10-01	-0.11500
1990-01-01	-0.15000
1990-04-01	-0.15000
1990-07-01	-0.03233
1990-10-01	0.12560
1991-01-01	-0.12978
1991-10-01	-0.10560
1992-01-01	-0.09358
1992-04-01	-0.32729
1992-07-01	-0.05293
1993-04-01	-0.02500
1993-07-01	0.02606
1993-10-01	0.36636
1994-01-01	0.10525
1994-04-01	0.09417
1994-07-01	0.38181
1994-10-01	0.06292
1995-07-01	0.24919
1995-10-01	-0.13347
1996-01-01	-0.04548
1996-04-01	-0.09020
1996-07-01	-0.08960
1996-10-01	0.02392
1997-01-01	0.02980
1997-04-01	0.05072
1997-07-01	-0.02384
1998-01-01	-0.03000
1998-04-01	0.22540
1998-07-01	-0.10359
1998-10-01	-0.09182
1999-01-01	0.02205
1999-04-01	0.03528
1999-07-01	-0.03512
1999-10-01	0.44168
2000-01-01	0.08449
2000-04-01	0.21949
2000-07-01	-0.09966
2000-10-01	0.03447
2001-01-01	0.02248
2001-04-01	-0.27870
2001-07-01	0.14700
2001-10-01	-0.10531
2002-01-01	-0.04168
2002-04-01	0.29273
2002-07-01	-0.07744
2002-10-01	-0.21773
2003-01-01	0.11610
2003-04-01	-0.02534
2003-07-01	0.42341
2003-10-01	0.00418
2004-01-01	0.36568
2004-04-01	0.39713
2004-07-01	0.28030
2004-10-01	0.28723
2005-01-01	0.60472
2005-04-01	-0.11227
2005-07-01	0.51900
2005-10-01	0.70969
2006-01-01	0.20612
2006-04-01	-0.36769
2006-07-01	0.10062
2006-10-01	-0.58007
2007-01-01	0.59299
2007-04-01	0.45037
2007-07-01	0.85658
2007-10-01	0.34580
2008-01-01	0.61420
2008-04-01	0.19780
2008-07-01	0.08565
2008-10-01	-0.46590
2009-01-01	-0.39601
2009-04-01	1.51496
2009-07-01	0.02408
2009-10-01	0.12258
2010-01-01	-0.14982
2010-04-01	-0.04173
2010-07-01	-0.09849
2010-10-01	-0.81039
2011-01-01	-0.21691
2011-04-01	0.35690
2011-07-01	-0.40951
2011-10-01	0.10409
2012-01-01	0.27543
2012-04-01	0.35574
2012-07-01	1.30090
2012-10-01	1.15586
2013-01-01	0.22261
2013-04-01	0.45562
2013-07-01	-0.00424
2013-10-01	-0.03392
2014-01-01	0.36056
2014-04-01	-1.30107
2014-07-01	1.59456
2014-10-01	0.05152
2015-01-01	0.94979
2015-04-01	-0.01024