Quarter	Billions of US Dollars
1978-01-01	0.02460
1978-04-01	0.04420
1979-01-01	0.03000
1979-04-01	0.08000
1979-07-01	0.06620
1980-04-01	0.04600
1981-07-01	0.04300
1982-01-01	0.04200
1983-01-01	-0.00397
1983-07-01	0.10050
1984-01-01	0.10400
1984-04-01	-0.08000
1984-07-01	0.04190
1985-01-01	0.40000
1985-04-01	0.04010
1985-07-01	0.02110
1985-10-01	0.29517
1986-04-01	-0.05878
1986-07-01	-0.05778
1988-04-01	-0.07961
1988-07-01	0.24840
1989-04-01	-0.07243
1989-07-01	0.20000
1990-01-01	-0.11290
1990-04-01	-0.30000
1990-07-01	-0.06886
1991-01-01	-0.08323
1991-07-01	-0.16936
1991-10-01	-0.06002
1992-01-01	0.30000
1992-07-01	0.10000
1992-10-01	0.03830
1993-01-01	0.33645
1993-04-01	0.26340
1993-07-01	0.09379
1993-10-01	1.20370
1994-01-01	1.48498
1994-04-01	0.13919
1994-07-01	0.46914
1994-10-01	0.31320
1995-01-01	0.19000
1995-04-01	0.28860
1995-07-01	0.35397
1995-10-01	0.48240
1996-01-01	1.20640
1996-04-01	0.84837
1996-07-01	1.80234
1996-10-01	1.10915
1997-01-01	0.73212
1997-04-01	1.15609
1997-07-01	0.55583
1997-10-01	0.09221
1998-01-01	-0.23185
1998-04-01	-0.00414
1998-07-01	-0.10506
1998-10-01	0.16685
1999-01-01	-0.45320
1999-04-01	-0.06042
1999-07-01	-0.63493
1999-10-01	-0.11650
2000-01-01	-0.29055
2000-04-01	-0.14287
2000-07-01	-0.21900
2000-10-01	-0.38502
2001-01-01	-0.70613
2001-04-01	-0.23184
2001-07-01	-1.25821
2001-10-01	-0.42536
2002-01-01	-0.35144
2002-04-01	-0.33211
2002-07-01	-0.27608
2002-10-01	-0.05585
2003-01-01	-0.12624
2003-04-01	-0.06655
2003-07-01	-0.19024
2003-10-01	-0.63187
2004-01-01	-0.83500
2004-04-01	0.83815
2004-07-01	0.39130
2004-10-01	-0.09643
2005-01-01	0.20500
2005-04-01	1.15968
2005-07-01	0.19717
2005-10-01	0.32945
2006-01-01	-0.09983
2006-04-01	0.14267
2006-07-01	0.31000
2006-10-01	0.26563
2007-01-01	-0.65820
2007-04-01	-1.05880
2007-07-01	-0.05049
2007-10-01	-0.11135
2008-01-01	0.15000
2008-04-01	-0.08060
2008-07-01	-0.02956
2008-10-01	-0.51784
2009-01-01	-0.20000
2009-04-01	-0.45000
2009-07-01	-0.26751
2009-10-01	-0.15000
2010-01-01	-0.25000
2010-04-01	-0.33620
2010-07-01	0.70000
2010-10-01	1.08000
2011-01-01	0.32783
2011-04-01	0.65022
2011-07-01	-0.21842
2011-10-01	0.38736
2012-01-01	1.43906
2012-04-01	0.50020
2012-07-01	2.22845
2012-10-01	2.12786
2013-01-01	1.01630
2013-04-01	-0.07078
2013-07-01	0.50000
2013-10-01	0.73500
2014-01-01	0.29040
2014-04-01	2.75031
2014-07-01	-0.31345
2014-10-01	-0.10004
2015-01-01	0.04776
2015-04-01	-0.65143