Quarter	Billions of US Dollars
1987-04-01	-0.0670
1988-07-01	-0.0750
1989-01-01	0.0744
1990-04-01	0.2500
1990-07-01	0.3007
1990-10-01	0.4500
1991-04-01	-0.0169
1992-04-01	-0.2669
1993-01-01	-0.0413
1993-07-01	-0.0338
1993-10-01	-0.0883
1994-10-01	0.0806
1995-01-01	0.1169
1995-04-01	-0.4090
1995-07-01	-0.3186
1995-10-01	-0.0100
1996-01-01	0.1326
1996-10-01	0.4683
1997-01-01	0.2961
1997-04-01	-0.0043
1997-10-01	0.8548
1998-01-01	0.2582
1998-04-01	1.8041
1998-07-01	0.0422
1998-10-01	0.6262
1999-01-01	0.8489
1999-04-01	1.7550
1999-07-01	-0.0719
1999-10-01	0.8051
2000-01-01	1.3844
2000-04-01	0.7470
2000-07-01	-0.0088
2000-10-01	0.5810
2001-01-01	0.6901
2001-04-01	2.1617
2001-07-01	1.0635
2001-10-01	3.0790
2002-01-01	0.2779
2002-04-01	4.3937
2002-07-01	0.6284
2002-10-01	1.5898
2003-01-01	4.1716
2003-04-01	4.4135
2003-07-01	1.3705
2003-10-01	10.5693
2004-01-01	2.5984
2004-04-01	6.4573
2004-07-01	2.1214
2004-10-01	10.1992
2005-01-01	4.3660
2005-04-01	13.3523
2005-07-01	5.2846
2005-10-01	16.3311
2006-01-01	21.2288
2006-04-01	28.8748
2006-07-01	9.8414
2006-10-01	14.4321
2007-01-01	20.0624
2007-04-01	19.4393
2007-07-01	18.2921
2007-10-01	4.8644
2008-01-01	6.2699
2008-04-01	24.8386
2008-07-01	9.5376
2008-10-01	28.6927
2009-01-01	27.8813
2009-04-01	19.0632
2009-07-01	19.3402
2009-10-01	11.3237
2010-01-01	6.2311
2010-04-01	4.8087
2010-07-01	18.7152
2010-10-01	7.4081
2011-01-01	20.6374
2011-04-01	9.9105
2011-07-01	9.1796
2011-10-01	6.7681
2012-01-01	37.7413
2012-04-01	-8.2274
2012-07-01	-5.6889
2012-10-01	20.6280
2013-01-01	-2.9920
2013-04-01	-3.0185
2013-07-01	-2.3600
2013-10-01	-3.3706
2014-01-01	-20.6991
2014-04-01	-1.5371
2014-07-01	-15.1050
2014-10-01	-6.5801
2015-01-01	-1.9048
2015-04-01	-6.1236