Quarter	Billions of US Dollars
1987-07-01	0.0266
1988-01-01	0.0302
1989-04-01	-0.0043
1989-10-01	0.0699
1990-01-01	0.1208
1990-07-01	0.1935
1990-10-01	0.1515
1991-01-01	0.0065
1991-04-01	0.2111
1991-07-01	0.0410
1991-10-01	0.0418
1992-01-01	0.2527
1992-07-01	0.0800
1992-10-01	0.4353
1993-01-01	-0.0219
1993-04-01	-0.0622
1993-07-01	0.1084
1993-10-01	0.2332
1994-01-01	-0.1285
1994-04-01	0.0570
1994-07-01	0.2746
1994-10-01	0.1790
1995-01-01	0.1422
1995-04-01	0.3325
1995-07-01	0.6021
1995-10-01	2.2833
1996-01-01	2.5357
1996-04-01	1.2652
1996-07-01	0.4094
1996-10-01	1.3803
1997-01-01	2.3544
1997-04-01	2.4229
1997-07-01	1.7042
1997-10-01	1.5243
1998-01-01	2.1973
1998-04-01	1.3103
1998-07-01	2.7591
1998-10-01	-1.3556
1999-01-01	2.5085
1999-04-01	2.2297
1999-07-01	1.9407
1999-10-01	3.6749
2000-01-01	-0.2235
2000-04-01	2.8475
2000-07-01	1.7222
2000-10-01	-0.7576
2001-01-01	3.8544
2001-04-01	4.2354
2001-07-01	-1.1731
2001-10-01	3.9148
2002-01-01	1.8120
2002-04-01	1.8556
2002-07-01	4.4148
2002-10-01	6.7449
2003-01-01	3.1610
2003-04-01	3.8717
2003-07-01	8.6169
2003-10-01	24.8433
2004-01-01	9.0108
2004-04-01	10.3432
2004-07-01	18.0344
2004-10-01	34.7505
2005-01-01	17.6750
2005-04-01	29.7629
2005-07-01	9.2340
2005-10-01	37.9255
2006-01-01	32.1996
2006-04-01	45.4781
2006-07-01	63.6476
2006-10-01	56.7924
2007-01-01	53.9978
2007-04-01	80.7604
2007-07-01	40.7772
2007-10-01	34.1898
2008-01-01	13.1465
2008-04-01	44.7912
2008-07-01	17.5898
2008-10-01	58.4034
2009-01-01	45.1100
2009-04-01	16.6762
2009-07-01	29.9778
2009-10-01	-6.1341
2010-01-01	-12.9696
2010-04-01	7.4086
2010-07-01	-1.2878
2010-10-01	3.2542
2011-01-01	-67.2360
2011-04-01	-15.2372
2011-07-01	-7.5399
2011-10-01	5.8337
2012-01-01	36.1035
2012-04-01	-5.3175
2012-07-01	-9.3709
2012-10-01	2.2061
2013-01-01	-4.7129
2013-04-01	-11.3122
2013-07-01	-7.9155
2013-10-01	-2.4444
2014-01-01	-37.9053
2014-04-01	-3.0046
2014-07-01	-11.5044
2014-10-01	-39.4886
2015-01-01	-21.5502
2015-04-01	27.8026