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	0.39390
1991-01-01	0.17380
1991-07-01	0.04540
1991-10-01	0.39544
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
1999-04-01	0.14397
1999-07-01	-0.16215
1999-10-01	-0.00352
2000-01-01	-0.20866
2000-04-01	-0.09621
2000-07-01	0.12446
2000-10-01	0.30050
2001-01-01	0.04633
2001-04-01	0.09798
2001-07-01	0.41755
2001-10-01	2.18246
2002-01-01	-0.06151
2002-04-01	0.94353
2002-07-01	0.11565
2002-10-01	0.28568
2003-01-01	-0.13614
2003-04-01	0.63978
2003-07-01	1.14652
2003-10-01	1.06776
2004-01-01	0.58915
2004-04-01	1.22069
2004-07-01	0.87642
2004-10-01	1.62736
2005-01-01	0.15440
2005-04-01	1.40160
2005-07-01	-0.16022
2005-10-01	0.38057
2006-01-01	1.83219
2006-04-01	-0.25049
2006-07-01	2.64439
2006-10-01	2.20487
2007-01-01	5.32565
2007-04-01	0.33390
2007-07-01	-0.06686
2007-10-01	-1.64944
2008-01-01	-0.24163
2008-04-01	0.19823
2008-07-01	-0.16576
2008-10-01	0.60524
2009-01-01	0.92446
2009-04-01	-0.61998
2009-07-01	0.73686
2009-10-01	-0.24315
2010-01-01	-0.11157
2010-04-01	-0.36247
2010-07-01	-0.16289
2010-10-01	-1.04491
2011-01-01	-0.55492
2011-04-01	-0.47858
2011-07-01	-0.94641
2011-10-01	-1.07915
2012-01-01	1.24902
2012-04-01	-0.18426
2012-07-01	-1.73507
2012-10-01	0.31647
2013-01-01	-0.72217
2013-04-01	-0.01317
2013-07-01	0.55417
2013-10-01	0.60033
2014-01-01	-1.55185
2014-04-01	-0.18103
2014-07-01	0.35856
2014-10-01	-1.09820
2015-01-01	-0.63834
2015-04-01	-0.84597