Quarter	Billions of US Dollars
1987-01-01	0.0571
1987-04-01	0.1473
1987-07-01	0.1222
1987-10-01	0.1239
1988-01-01	-0.0667
1988-04-01	0.5948
1988-07-01	0.9315
1988-10-01	0.6654
1989-01-01	1.1629
1989-04-01	0.3122
1989-07-01	-0.3303
1989-10-01	0.6083
1990-01-01	0.2782
1990-04-01	-0.3523
1990-07-01	-0.6139
1990-10-01	-0.3231
1991-01-01	-0.3379
1991-04-01	-0.5010
1991-07-01	-0.3335
1991-10-01	0.0274
1992-01-01	-1.0582
1992-04-01	-1.0005
1992-07-01	-0.1152
1992-10-01	0.0244
1993-01-01	-0.5289
1993-04-01	-0.1814
1993-07-01	0.6007
1993-10-01	-0.2983
1994-01-01	-0.4653
1994-04-01	-0.2902
1994-07-01	0.5081
1994-10-01	-0.0743
1995-01-01	0.3491
1995-04-01	0.5316
1995-07-01	-0.2871
1995-10-01	-0.6609
1996-01-01	0.6405
1996-04-01	0.7355
1996-07-01	0.9471
1996-10-01	1.7700
1997-01-01	0.7000
1997-04-01	0.6471
1997-07-01	0.3043
1997-10-01	0.2659
1998-01-01	1.2145
1998-04-01	1.4558
1998-07-01	-0.0750
1998-10-01	0.0483
1999-01-01	2.2457
1999-04-01	1.6786
1999-07-01	0.4831
1999-10-01	-0.7126
2000-01-01	-0.1287
2000-04-01	-0.5025
2000-07-01	-1.3624
2000-10-01	0.4234
2001-01-01	-0.2788
2001-04-01	-0.8862
2001-07-01	0.7666
2001-10-01	0.3730
2002-01-01	0.8051
2002-04-01	-1.7719
2002-07-01	0.3554
2002-10-01	-0.8518
2003-01-01	1.1311
2003-04-01	0.8096
2003-07-01	0.0372
2003-10-01	-0.1029
2004-01-01	-0.8817
2004-04-01	2.5673
2004-07-01	1.2478
2004-10-01	-0.7049
2005-01-01	-0.6542
2005-04-01	-0.0706
2005-07-01	0.0516
2005-10-01	1.6007
2006-01-01	2.4213
2006-04-01	-0.4921
2006-07-01	1.9249
2006-10-01	1.1140
2007-01-01	3.0465
2007-04-01	3.8786
2007-07-01	0.9341
2007-10-01	5.9026
2008-01-01	6.1686
2008-04-01	17.0292
2008-07-01	9.7602
2008-10-01	-4.3619
2009-01-01	-2.5624
2009-04-01	-10.0673
2009-07-01	-1.1051
2009-10-01	-3.5542
2010-01-01	2.0470
2010-04-01	10.2467
2010-07-01	6.2284
2010-10-01	6.9528
2011-01-01	11.4993
2011-04-01	-1.3755
2011-07-01	11.7358
2011-10-01	13.6991
2012-01-01	16.2786
2012-04-01	0.7134
2012-07-01	7.1666
2012-10-01	7.6088
2013-01-01	-2.2775
2013-04-01	9.4469
2013-07-01	23.6224
2013-10-01	16.2583
2014-01-01	7.4244
2014-04-01	13.9183
2014-07-01	21.3804
2014-10-01	2.5935
2015-01-01	14.0813
2015-04-01	7.7901