Quarter	Billions of US Dollars
1987-01-01	0.0500
1987-04-01	0.1500
1989-10-01	-0.0800
1991-01-01	0.0351
1991-04-01	0.1250
1991-07-01	0.1551
1993-04-01	0.1500
1993-07-01	1.1610
1993-10-01	2.0089
1994-01-01	1.7415
1994-04-01	0.5828
1994-07-01	1.0818
1994-10-01	2.0487
1995-01-01	-0.4459
1995-04-01	-0.1277
1995-07-01	0.3922
1995-10-01	0.7592
1996-01-01	0.7063
1996-04-01	1.8175
1996-07-01	1.3199
1996-10-01	2.8597
1997-01-01	2.8163
1997-04-01	3.2159
1997-07-01	3.3816
1997-10-01	-0.0204
1998-01-01	0.2851
1998-04-01	2.9873
1998-07-01	1.3436
1998-10-01	-0.2462
1999-01-01	6.3756
1999-04-01	0.4966
1999-07-01	0.2444
1999-10-01	1.5920
2000-01-01	0.9516
2000-04-01	1.9115
2000-07-01	5.0581
2000-10-01	2.2093
2001-01-01	8.7276
2001-04-01	4.1436
2001-07-01	1.6900
2001-10-01	0.9318
2002-01-01	0.1361
2002-04-01	-1.6600
2002-07-01	-0.5589
2002-10-01	2.1086
2003-01-01	-0.1876
2003-04-01	1.3245
2003-07-01	1.2663
2003-10-01	6.1305
2004-01-01	-0.8084
2004-04-01	3.0273
2004-07-01	1.1994
2004-10-01	4.3135
2005-01-01	5.9847
2005-04-01	9.7255
2005-07-01	5.0171
2005-10-01	4.0290
2006-01-01	3.3933
2006-04-01	5.2582
2006-07-01	4.1025
2006-10-01	7.2908
2007-01-01	9.0646
2007-04-01	6.9175
2007-07-01	-0.6450
2007-10-01	0.6112
2008-01-01	3.6467
2008-04-01	1.9658
2008-07-01	1.8906
2008-10-01	-3.2968
2009-01-01	-12.9234
2009-04-01	7.8000
2009-07-01	6.0450
2009-10-01	4.2844
2010-01-01	4.2597
2010-04-01	-4.2034
2010-07-01	2.4975
2010-10-01	-1.0690
2011-01-01	-8.7628
2011-04-01	1.5919
2011-07-01	0.6433
2011-10-01	1.0867
2012-01-01	11.2438
2012-04-01	7.9752
2012-07-01	8.5136
2012-10-01	13.3660
2013-01-01	7.1736
2013-04-01	-0.5962
2013-07-01	-2.9206
2013-10-01	-2.8629
2014-01-01	2.8659
2014-04-01	-1.6872
2014-07-01	6.6091
2014-10-01	3.1109
2015-01-01	9.2233
2015-04-01	2.8068