Quarter	Billions of US Dollars
1987-01-01	0.147
1987-04-01	1.381
1987-07-01	0.693
1987-10-01	0.434
1988-01-01	1.664
1988-04-01	2.052
1988-07-01	1.876
1988-10-01	1.510
1989-01-01	1.673
1989-04-01	0.879
1989-07-01	1.959
1989-10-01	1.782
1990-01-01	1.416
1990-04-01	1.445
1990-07-01	3.452
1990-10-01	1.339
1991-01-01	2.561
1991-04-01	3.156
1991-07-01	3.497
1991-10-01	1.751
1992-01-01	3.015
1992-04-01	1.937
1992-07-01	-0.287
1992-10-01	0.550
1993-01-01	0.277
1993-04-01	2.372
1993-07-01	2.304
1993-10-01	1.861
1994-01-01	2.358
1994-04-01	1.411
1994-07-01	2.302
1994-10-01	-0.237
1995-01-01	0.309
1995-04-01	-0.774
1995-07-01	0.734
1995-10-01	-1.023
1996-01-01	1.386
1996-04-01	1.358
1996-07-01	-1.166
1996-10-01	11.861
1997-01-01	5.490
1997-04-01	-0.103
1997-07-01	2.644
1997-10-01	13.005
1998-01-01	6.631
1998-04-01	6.107
1998-07-01	0.027
1998-10-01	0.205
1999-01-01	17.646
1999-04-01	18.335
1999-07-01	12.499
1999-10-01	11.267
2000-01-01	9.611
2000-04-01	12.721
2000-07-01	6.328
2000-10-01	9.552
2001-01-01	14.065
2001-04-01	14.096
2001-07-01	16.852
2001-10-01	14.614
2002-01-01	9.714
2002-04-01	20.930
2002-07-01	13.742
2002-10-01	12.547
2003-01-01	22.332
2003-04-01	28.901
2003-07-01	14.635
2003-10-01	27.832
2004-01-01	39.164
2004-04-01	24.387
2004-07-01	28.058
2004-10-01	30.695
2005-01-01	34.012
2005-04-01	32.866
2005-07-01	22.565
2005-10-01	55.285
2006-01-01	31.192
2006-04-01	47.110
2006-07-01	52.488
2006-10-01	79.240
2007-01-01	53.806
2007-04-01	63.708
2007-07-01	-5.146
2007-10-01	-1.833
2008-01-01	-4.507
2008-04-01	28.885
2008-07-01	55.777
2008-10-01	109.582
2009-01-01	45.607
2009-04-01	8.600
2009-07-01	37.773
2009-10-01	11.969
2010-01-01	-4.166
2010-04-01	-13.184
2010-07-01	5.576
2010-10-01	-1.795
2011-01-01	-27.242
2011-04-01	-2.848
2011-07-01	-16.790
2011-10-01	40.990
2012-01-01	0.871
2012-04-01	-40.436
2012-07-01	17.590
2012-10-01	19.807
2013-01-01	4.095
2013-04-01	14.461
2013-07-01	0.700
2013-10-01	5.028
2014-01-01	6.763
2014-04-01	18.679
2014-07-01	18.575
2014-10-01	-4.763
2015-01-01	13.429
2015-04-01	19.487