Quarter	Billions of US Dollars
1987-01-01	0.4630
1987-04-01	0.5250
1987-07-01	0.3470
1987-10-01	0.3050
1988-01-01	0.3690
1988-04-01	0.4330
1988-07-01	0.4680
1988-10-01	0.4240
1989-01-01	0.4100
1989-04-01	0.4050
1989-07-01	0.3810
1989-10-01	0.3170
1990-01-01	0.4290
1990-04-01	0.4210
1990-07-01	0.0930
1990-10-01	0.3300
1991-01-01	0.3440
1991-04-01	0.3060
1991-07-01	0.2890
1991-10-01	0.1170
1992-01-01	0.2250
1992-04-01	0.2740
1992-07-01	0.2240
1992-10-01	0.0930
1993-01-01	0.2540
1993-04-01	0.1520
1993-07-01	0.2524
1993-10-01	0.1838
1994-01-01	0.2175
1994-04-01	0.2897
1994-07-01	0.2275
1994-10-01	0.2143
1995-01-01	0.2590
1995-04-01	0.9165
1995-07-01	1.4944
1995-10-01	2.0178
1996-01-01	1.8718
1996-04-01	2.1917
1996-07-01	3.8980
1996-10-01	5.0630
1997-01-01	4.6309
1997-04-01	4.0918
1997-07-01	3.2795
1997-10-01	1.4839
1998-01-01	1.3623
1998-04-01	1.6381
1998-07-01	1.1535
1998-10-01	1.1897
1999-01-01	1.2623
1999-04-01	0.9900
1999-07-01	0.9775
1999-10-01	1.2503
2000-01-01	1.4366
2000-04-01	1.8514
2000-07-01	2.4019
2000-10-01	1.8470
2001-01-01	1.0492
2001-04-01	1.1472
2001-07-01	0.7181
2001-10-01	0.7134
2002-01-01	0.4982
2002-04-01	0.8584
2002-07-01	0.8314
2002-10-01	0.9175
2003-01-01	1.0003
2003-04-01	0.7427
2003-07-01	1.2911
2003-10-01	1.4943
2004-01-01	2.0756
2004-04-01	1.7040
2004-07-01	1.4402
2004-10-01	1.6462
2005-01-01	1.8239
2005-04-01	2.1089
2005-07-01	2.0912
2005-10-01	2.3651
2006-01-01	3.1654
2006-04-01	3.6756
2006-07-01	4.5709
2006-10-01	4.8871
2007-01-01	5.4741
2007-04-01	5.7139
2007-07-01	6.8599
2007-10-01	7.1832
2008-01-01	8.3401
2008-04-01	9.9789
2008-07-01	9.2208
2008-10-01	3.4375
2009-01-01	3.8857
2009-04-01	6.4269
2009-07-01	7.4106
2009-10-01	7.5644
2010-01-01	7.5524
2010-04-01	6.8779
2010-07-01	6.8136
2010-10-01	5.0188
2011-01-01	5.4920
2011-04-01	5.6742
2011-07-01	6.2095
2011-10-01	6.9605
2012-01-01	7.4010
2012-04-01	7.8154
2012-07-01	8.4795
2012-10-01	6.8186
2013-01-01	6.8283
2013-04-01	7.1107
2013-07-01	8.6635
2013-10-01	9.6847
2014-01-01	9.8717
2014-04-01	9.4549
2014-07-01	9.1643
2014-10-01	10.3404
2015-01-01	10.1119
2015-04-01	10.6549