Quarter	Billions of US Dollars
1987-01-01	0.0718
1987-04-01	0.2969
1987-07-01	0.1098
1987-10-01	-0.0116
1988-01-01	0.1948
1988-04-01	0.1373
1988-07-01	0.3929
1988-10-01	-0.0043
1989-01-01	0.7204
1989-04-01	0.3092
1989-07-01	0.1043
1989-10-01	1.1655
1990-01-01	0.8605
1990-04-01	0.5688
1990-07-01	0.5386
1990-10-01	0.9661
1991-01-01	1.7760
1991-04-01	1.5894
1991-07-01	0.8220
1991-10-01	1.6787
1992-01-01	2.4480
1992-04-01	1.2716
1992-07-01	0.6341
1992-10-01	1.0620
1993-01-01	1.1736
1993-04-01	0.6171
1993-07-01	2.5814
1993-10-01	2.2333
1994-01-01	0.8085
1994-04-01	0.1294
1994-07-01	1.9866
1994-10-01	1.5600
1995-01-01	1.3688
1995-04-01	1.9800
1995-07-01	2.6979
1995-10-01	3.7115
1996-01-01	2.2749
1996-04-01	2.4167
1996-07-01	2.7233
1996-10-01	3.5573
1997-01-01	2.9235
1997-04-01	1.9942
1997-07-01	3.6527
1997-10-01	-0.2070
1998-01-01	2.8719
1998-04-01	0.7054
1998-07-01	-0.6268
1998-10-01	0.2456
1999-01-01	3.0164
1999-04-01	1.1855
1999-07-01	2.2359
1999-10-01	2.5203
2000-01-01	3.8163
2000-04-01	3.2161
2000-07-01	-0.5447
2000-10-01	2.4571
2001-01-01	3.5835
2001-04-01	2.3097
2001-07-01	-0.7564
2001-10-01	-2.0659
2002-01-01	1.4094
2002-04-01	3.5395
2002-07-01	1.4231
2002-10-01	-0.2183
2003-01-01	7.4553
2003-04-01	0.5248
2003-07-01	-0.2150
2003-10-01	3.6750
2004-01-01	4.3073
2004-04-01	-5.6966
2004-07-01	9.0481
2004-10-01	3.5661
2005-01-01	-0.6183
2005-04-01	4.8756
2005-07-01	6.0324
2005-10-01	1.2132
2006-01-01	11.3741
2006-04-01	0.7662
2006-07-01	3.3402
2006-10-01	14.0212
2007-01-01	12.9314
2007-04-01	4.6428
2007-07-01	3.0319
2007-10-01	10.3388
2008-01-01	2.4641
2008-04-01	12.7913
2008-07-01	-6.2329
2008-10-01	-11.9657
2009-01-01	12.1338
2009-04-01	6.8882
2009-07-01	1.5548
2009-10-01	-2.3299
2010-01-01	17.3424
2010-04-01	2.4029
2010-07-01	1.3850
2010-10-01	-6.1609
2011-01-01	-7.9697
2011-04-01	-3.9082
2011-07-01	-9.5562
2011-10-01	-14.1543
2012-01-01	-10.2543
2012-04-01	-6.7076
2012-07-01	-0.6863
2012-10-01	-3.9374
2013-01-01	-19.2895
2013-04-01	-10.1907
2013-07-01	5.3873
2013-10-01	30.4496
2014-01-01	-25.0144
2014-04-01	-8.8167
2014-07-01	1.8832
2014-10-01	2.5549
2015-01-01	12.7577
2015-04-01	-2.5459