Quarter	Billions of US Dollars
1991-01-01	0.0340
1991-04-01	0.2020
1991-07-01	0.4070
1991-10-01	0.2650
1992-01-01	0.8640
1992-04-01	-1.0690
1992-07-01	-0.9610
1992-10-01	0.0100
1993-01-01	-0.2630
1993-04-01	-0.1920
1993-07-01	41.8930
1993-10-01	2.4684
1994-01-01	-0.1587
1994-04-01	5.4502
1994-07-01	1.1072
1994-10-01	-7.0819
1995-01-01	-0.5307
1995-04-01	2.4467
1995-07-01	6.1716
1995-10-01	0.4965
1996-01-01	5.8043
1996-04-01	8.0328
1996-07-01	-1.0387
1996-10-01	1.3057
1997-01-01	6.3596
1997-04-01	-2.9182
1997-07-01	6.1653
1997-10-01	-1.3785
1998-01-01	6.3595
1998-04-01	1.9924
1998-07-01	8.8637
1998-10-01	-0.2457
1999-01-01	20.9351
1999-04-01	-3.7923
1999-07-01	16.2583
1999-10-01	1.1766
2000-01-01	3.8253
2000-04-01	3.3992
2000-07-01	20.4490
2000-10-01	14.6293
2001-01-01	24.7995
2001-04-01	5.1936
2001-07-01	-14.7209
2001-10-01	2.7731
2002-01-01	6.8638
2002-04-01	1.9741
2002-07-01	17.9138
2002-10-01	1.8483
2003-01-01	34.9363
2003-04-01	5.7045
2003-07-01	-12.6781
2003-10-01	46.4120
2004-01-01	1.6456
2004-04-01	0.4606
2004-07-01	35.0009
2004-10-01	17.5941
2005-01-01	26.1405
2005-04-01	13.3775
2005-07-01	0.8219
2005-10-01	-2.8993
2006-01-01	45.8872
2006-04-01	14.0538
2006-07-01	36.3532
2006-10-01	24.0981
2007-01-01	95.9811
2007-04-01	31.2804
2007-07-01	-69.0448
2007-10-01	-42.1737
2008-01-01	43.4912
2008-04-01	-5.2823
2008-07-01	-12.0232
2008-10-01	-63.0739
2009-01-01	-10.1154
2009-04-01	-13.3930
2009-07-01	29.3433
2009-10-01	-55.2003
2010-01-01	15.4108
2010-04-01	-42.4821
2010-07-01	-3.4599
2010-10-01	-31.6268
2011-01-01	17.6842
2011-04-01	-4.1649
2011-07-01	25.8253
2011-10-01	3.8579
2012-01-01	35.6957
2012-04-01	-36.5585
2012-07-01	-16.7915
2012-10-01	-43.8833
2013-01-01	25.8439
2013-04-01	2.0511
2013-07-01	13.1877
2013-10-01	-38.7266
2014-01-01	30.2582
2014-04-01	10.1933
2014-07-01	15.0765
2014-10-01	-10.9195
2015-01-01	21.8164
2015-04-01	-28.1458