Quarter	Billions of US Dollars
1987-07-01	0.09650
1988-07-01	0.10120
1988-10-01	0.07990
1990-01-01	0.17760
1990-04-01	0.14330
1990-10-01	0.33590
1991-01-01	0.16080
1991-07-01	0.04540
1991-10-01	0.36644
1992-01-01	0.20000
1992-04-01	0.17960
1992-07-01	0.12570
1992-10-01	0.19568
1993-01-01	0.23550
1993-04-01	0.20630
1993-10-01	0.48040
1994-04-01	0.10580
1994-07-01	-0.05386
1994-10-01	0.17149
1995-01-01	0.29580
1995-04-01	-0.21487
1995-07-01	0.35913
1995-10-01	0.60379
1996-01-01	-0.15311
1996-04-01	0.25199
1996-07-01	0.07507
1996-10-01	0.15520
1997-01-01	0.28429
1997-07-01	0.18728
1997-10-01	-0.08545
1998-01-01	-0.02888
1998-04-01	0.09196
1998-10-01	-0.09022
1999-01-01	0.11582
1999-04-01	0.14397
1999-07-01	-0.08413
1999-10-01	0.02322
2000-01-01	-0.20866
2000-04-01	0.02084
2000-07-01	0.05663
2000-10-01	0.42942
2001-01-01	0.04633
2001-04-01	0.09798
2001-07-01	0.48021
2001-10-01	2.18246
2002-01-01	-0.06151
2002-04-01	0.33577
2002-07-01	0.50906
2002-10-01	0.39719
2003-01-01	-0.13614
2003-04-01	0.89366
2003-07-01	2.10257
2003-10-01	1.06776
2004-01-01	0.97748
2004-04-01	1.46104
2004-07-01	0.90371
2004-10-01	2.08751
2005-01-01	0.41930
2005-04-01	2.10678
2005-07-01	-0.16022
2005-10-01	0.38057
2006-01-01	1.83219
2006-04-01	0.36641
2006-07-01	3.15400
2006-10-01	3.19971
2007-01-01	5.58772
2007-04-01	1.40333
2007-07-01	-0.06686
2007-10-01	-1.93931
2008-01-01	-0.24163
2008-04-01	0.32669
2008-07-01	-0.20029
2008-10-01	0.60524
2009-01-01	0.86729
2009-04-01	0.03368
2009-07-01	-0.11066
2009-10-01	0.08068
2010-01-01	-0.11426
2010-04-01	-0.33207
2010-07-01	-0.30537
2010-10-01	-1.00090
2011-01-01	-0.55060
2011-04-01	-1.15132
2011-07-01	-0.91715
2011-10-01	-1.05952
2012-01-01	-0.41307
2012-04-01	0.29277
2012-07-01	-2.53646
2012-10-01	-0.92740
2013-01-01	-0.72118
2013-04-01	-0.02267
2013-07-01	-1.29734
2013-10-01	-1.04441
2014-01-01	-1.59917
2014-04-01	-1.65170
2014-07-01	0.23321
2014-10-01	-0.17354
2015-01-01	-1.15354
2015-04-01	-1.15083