Quarter	Billions of US Dollars
1987-01-01	0.6717
1987-04-01	0.1784
1987-07-01	0.1019
1987-10-01	-0.0026
1988-01-01	0.2973
1988-04-01	1.0799
1988-07-01	0.6293
1988-10-01	0.9181
1989-01-01	1.5755
1989-04-01	1.4347
1989-07-01	0.4122
1989-10-01	1.4257
1990-01-01	1.4390
1990-04-01	0.3201
1990-07-01	0.9379
1990-10-01	0.0690
1991-01-01	0.2383
1991-04-01	0.2784
1991-07-01	-0.2253
1991-10-01	-0.9490
1992-01-01	-1.5725
1992-04-01	0.2003
1992-07-01	0.3858
1992-10-01	-0.6018
1993-01-01	-1.3245
1993-04-01	-1.2588
1993-07-01	1.8194
1993-10-01	0.6438
1994-01-01	0.3108
1994-04-01	-1.0514
1994-07-01	0.6913
1994-10-01	0.1908
1995-01-01	-0.8488
1995-04-01	-1.0396
1995-07-01	0.3500
1995-10-01	0.2729
1996-01-01	-0.2247
1996-04-01	-0.2153
1996-07-01	0.5107
1996-10-01	-0.4052
1997-01-01	0.8917
1997-04-01	-0.1566
1997-07-01	0.7751
1997-10-01	0.8681
1998-01-01	-0.4018
1998-04-01	1.6791
1998-07-01	1.0948
1998-10-01	-0.6472
1999-01-01	1.0968
1999-04-01	2.5724
1999-07-01	3.5345
1999-10-01	-0.7063
2000-01-01	1.4705
2000-04-01	-0.1198
2000-07-01	-2.1560
2000-10-01	2.2687
2001-01-01	1.3582
2001-04-01	-0.3393
2001-07-01	0.2419
2001-10-01	-0.1272
2002-01-01	-0.2073
2002-04-01	1.1997
2002-07-01	2.8730
2002-10-01	0.9153
2003-01-01	3.9360
2003-04-01	-0.7993
2003-07-01	-0.6358
2003-10-01	2.4794
2004-01-01	7.8048
2004-04-01	2.7608
2004-07-01	0.2433
2004-10-01	4.6169
2005-01-01	3.1045
2005-04-01	8.5083
2005-07-01	4.4107
2005-10-01	-1.2835
2006-01-01	7.5744
2006-04-01	0.1821
2006-07-01	-2.5304
2006-10-01	6.8518
2007-01-01	10.3321
2007-04-01	10.8769
2007-07-01	-1.0286
2007-10-01	2.6989
2008-01-01	5.5811
2008-04-01	23.0877
2008-07-01	16.6074
2008-10-01	-8.7147
2009-01-01	10.2050
2009-04-01	14.4612
2009-07-01	8.7742
2009-10-01	0.4391
2010-01-01	22.1356
2010-04-01	-3.0436
2010-07-01	-2.2591
2010-10-01	-0.8175
2011-01-01	5.8089
2011-04-01	11.8524
2011-07-01	16.3628
2011-10-01	-4.3490
2012-01-01	13.5635
2012-04-01	10.8756
2012-07-01	5.9657
2012-10-01	-9.9693
2013-01-01	1.5483
2013-04-01	5.1869
2013-07-01	10.3170
2013-10-01	-11.5430
2014-01-01	0.3056
2014-04-01	-2.6828
2014-07-01	1.1737
2014-10-01	-3.1330
2015-01-01	5.5927
2015-04-01	3.0437