Quarter	Billions of US Dollars
1991-01-01	0.0590
1991-04-01	0.1880
1991-07-01	0.4570
1991-10-01	0.2720
1992-01-01	-0.1690
1992-04-01	0.7100
1992-07-01	-0.7990
1992-10-01	-0.0530
1993-01-01	-0.4840
1993-04-01	0.3640
1993-07-01	19.2980
1993-10-01	2.1083
1994-01-01	3.5457
1994-04-01	0.0913
1994-07-01	-0.0769
1994-10-01	-0.3806
1995-01-01	-1.2795
1995-04-01	2.4810
1995-07-01	6.2051
1995-10-01	6.5451
1996-01-01	1.2669
1996-04-01	5.5709
1996-07-01	1.9132
1996-10-01	7.2841
1997-01-01	0.6596
1997-04-01	7.3385
1997-07-01	5.8527
1997-10-01	2.6549
1998-01-01	2.2633
1998-04-01	-5.5491
1998-07-01	6.1260
1998-10-01	4.4633
1999-01-01	8.5850
1999-04-01	10.7586
1999-07-01	22.6755
1999-10-01	17.7952
2000-01-01	22.1018
2000-04-01	23.7626
2000-07-01	1.4415
2000-10-01	18.8962
2001-01-01	-14.1503
2001-04-01	-28.5073
2001-07-01	-15.9868
2001-10-01	-7.2945
2002-01-01	-9.3683
2002-04-01	8.4128
2002-07-01	0.7399
2002-10-01	-6.7142
2003-01-01	6.4015
2003-04-01	-9.2094
2003-07-01	-4.8765
2003-10-01	-2.9734
2004-01-01	27.7402
2004-04-01	5.8604
2004-07-01	-8.0118
2004-10-01	-0.5790
2005-01-01	5.4052
2005-04-01	-0.0077
2005-07-01	19.8720
2005-10-01	-10.7840
2006-01-01	11.4873
2006-04-01	6.7501
2006-07-01	0.0984
2006-10-01	15.2108
2007-01-01	15.4939
2007-04-01	32.9644
2007-07-01	53.7940
2007-10-01	60.3749
2008-01-01	50.8641
2008-04-01	44.5044
2008-07-01	-38.5018
2008-10-01	-76.4176
2009-01-01	-13.5798
2009-04-01	-47.6545
2009-07-01	7.3759
2009-10-01	-38.7414
2010-01-01	32.9363
2010-04-01	-6.0163
2010-07-01	30.1188
2010-10-01	-16.3794
2011-01-01	8.7260
2011-04-01	-8.1515
2011-07-01	-17.9901
2011-10-01	-14.8767
2012-01-01	81.3602
2012-04-01	5.4755
2012-07-01	-19.2299
2012-10-01	3.4736
2013-01-01	-3.9374
2013-04-01	15.5770
2013-07-01	-0.6876
2013-10-01	27.8546
2014-01-01	-27.9477
2014-04-01	19.4935
2014-07-01	15.7619
2014-10-01	-4.7600
2015-01-01	12.8504
2015-04-01	9.5472