Quarter	Billions of US Dollars
1987-01-01	0.1125
1987-04-01	-0.2637
1987-07-01	0.1973
1987-10-01	-0.2224
1988-01-01	0.2838
1988-04-01	0.0478
1988-07-01	-0.5709
1988-10-01	0.0392
1989-01-01	-0.0303
1989-04-01	-0.1753
1989-07-01	0.1058
1989-10-01	0.1905
1990-01-01	0.3021
1990-04-01	0.4424
1990-07-01	0.4196
1990-10-01	-0.1157
1991-01-01	0.4924
1991-04-01	0.3866
1991-07-01	-0.1546
1991-10-01	0.1593
1992-01-01	0.3306
1992-04-01	0.5403
1992-07-01	0.9815
1992-10-01	0.7489
1993-01-01	0.0956
1993-04-01	1.5615
1993-07-01	0.9451
1993-10-01	1.0678
1994-01-01	1.0265
1994-04-01	1.0576
1994-07-01	-0.4464
1994-10-01	-0.0459
1995-01-01	-0.0744
1995-04-01	-0.5279
1995-07-01	-0.5444
1995-10-01	0.2084
1996-01-01	-0.0513
1996-04-01	3.5337
1996-07-01	1.1872
1996-10-01	1.1864
1997-01-01	1.1512
1997-04-01	0.6822
1997-07-01	0.3737
1997-10-01	4.3086
1998-01-01	7.2969
1998-04-01	0.7398
1998-07-01	4.6098
1998-10-01	3.1954
1999-01-01	1.6015
1999-04-01	2.5482
1999-07-01	-0.5295
1999-10-01	4.1590
2000-01-01	2.9798
2000-04-01	1.1657
2000-07-01	3.3356
2000-10-01	6.8179
2001-01-01	1.6452
2001-04-01	4.5339
2001-07-01	3.5571
2001-10-01	6.4340
2002-01-01	4.3441
2002-04-01	7.8190
2002-07-01	3.8303
2002-10-01	3.6557
2003-01-01	5.8939
2003-04-01	17.7408
2003-07-01	7.4766
2003-10-01	4.7752
2004-01-01	5.9075
2004-04-01	10.1818
2004-07-01	8.3520
2004-10-01	18.6786
2005-01-01	9.9633
2005-04-01	8.4472
2005-07-01	1.1471
2005-10-01	2.2160
2006-01-01	7.4281
2006-04-01	-0.0345
2006-07-01	-0.6902
2006-10-01	17.0276
2007-01-01	0.4267
2007-04-01	6.6419
2007-07-01	2.0058
2007-10-01	12.8700
2008-01-01	-5.7960
2008-04-01	4.2025
2008-07-01	10.1489
2008-10-01	28.9233
2009-01-01	34.3272
2009-04-01	61.0526
2009-07-01	-2.0229
2009-10-01	20.4985
2010-01-01	10.8765
2010-04-01	15.3486
2010-07-01	9.5956
2010-10-01	10.0730
2011-01-01	20.7095
2011-04-01	-3.4846
2011-07-01	10.0765
2011-10-01	9.1810
2012-01-01	16.7978
2012-04-01	-21.8829
2012-07-01	9.8506
2012-10-01	-14.0264
2013-01-01	-5.9074
2013-04-01	0.6637
2013-07-01	-9.0586
2013-10-01	-9.3958
2014-01-01	11.2786
2014-04-01	-15.8583
2014-07-01	4.1264
2014-10-01	-2.9188
2015-01-01	10.1424
2015-04-01	-5.1246