Quarter	Billions of US Dollars
1987-04-01	0.05790
1987-07-01	0.04510
1987-10-01	0.04550
1988-01-01	0.03213
1988-04-01	0.14822
1988-07-01	0.04138
1988-10-01	0.08632
1989-01-01	0.13888
1989-04-01	0.00069
1989-07-01	0.00071
1989-10-01	0.05337
1990-01-01	0.01095
1990-04-01	0.11859
1990-07-01	-0.04837
1990-10-01	0.12833
1991-01-01	-0.12918
1991-04-01	-0.00711
1991-07-01	0.04459
1991-10-01	0.03976
1992-01-01	0.24328
1992-04-01	0.09765
1992-07-01	0.09259
1992-10-01	-0.00708
1993-01-01	0.14019
1993-04-01	0.08060
1993-07-01	0.42211
1993-10-01	0.23546
1994-01-01	-0.07941
1994-04-01	-0.01716
1994-07-01	0.04036
1994-10-01	-0.09954
1995-01-01	0.00769
1995-04-01	-0.02067
1995-07-01	0.01333
1995-10-01	-0.07224
1996-01-01	0.09793
1996-04-01	0.42533
1996-07-01	-0.02867
1996-10-01	-0.12306
1997-01-01	-0.17910
1997-04-01	0.21158
1997-07-01	0.11123
1997-10-01	-0.00440
1998-01-01	0.04753
1998-04-01	0.43791
1998-07-01	-0.13215
1998-10-01	0.61276
1999-01-01	0.46487
1999-04-01	0.25673
1999-07-01	0.24148
1999-10-01	0.23682
2000-01-01	0.55355
2000-04-01	0.58841
2000-07-01	0.05326
2000-10-01	0.74685
2001-01-01	1.21879
2001-04-01	0.27643
2001-07-01	-0.23258
2001-10-01	0.30147
2002-01-01	-0.23617
2002-04-01	0.51079
2002-07-01	-0.34257
2002-10-01	0.25189
2003-01-01	0.36942
2003-04-01	0.71029
2003-07-01	0.80900
2003-10-01	1.77574
2004-01-01	1.38510
2004-04-01	1.47777
2004-07-01	2.60664
2004-10-01	2.89085
2005-01-01	4.22595
2005-04-01	4.79138
2005-07-01	3.62403
2005-10-01	5.40615
2006-01-01	1.81395
2006-04-01	0.80701
2006-07-01	1.90851
2006-10-01	5.23604
2007-01-01	3.79636
2007-04-01	0.45783
2007-07-01	-0.77739
2007-10-01	0.73946
2008-01-01	0.87065
2008-04-01	-1.01467
2008-07-01	-2.32067
2008-10-01	-2.21228
2009-01-01	-3.09608
2009-04-01	-2.18351
2009-07-01	0.42155
2009-10-01	-3.05939
2010-01-01	-2.00681
2010-04-01	-0.62673
2010-07-01	-2.89613
2010-10-01	-3.12303
2011-01-01	-1.03596
2011-04-01	-2.37690
2011-07-01	-2.26436
2011-10-01	-2.35488
2012-01-01	-2.73805
2012-04-01	-1.89701
2012-07-01	-3.98242
2012-10-01	-2.15812
2013-01-01	-2.35445
2013-04-01	-1.81944
2013-07-01	-0.33345
2013-10-01	-0.27709
2014-01-01	0.03120
2014-04-01	-0.30947
2014-07-01	-0.03974
2014-10-01	-0.29975
2015-01-01	-0.17283
2015-04-01	-0.15290