Quarter	Billions of US Dollars
1987-01-01	0.5770
1987-04-01	1.0220
1987-07-01	1.5000
1987-10-01	1.2380
1988-01-01	1.6480
1988-04-01	1.6400
1988-07-01	1.8900
1988-10-01	2.0340
1989-01-01	2.3740
1989-04-01	2.4250
1989-07-01	2.7020
1989-10-01	2.8640
1990-01-01	2.7320
1990-04-01	2.4270
1990-07-01	2.8000
1990-10-01	2.5060
1991-01-01	2.5190
1991-04-01	2.2960
1991-07-01	2.2600
1991-10-01	1.9590
1992-01-01	3.1310
1992-04-01	2.6160
1992-07-01	2.6290
1992-10-01	3.0300
1993-01-01	3.0710
1993-04-01	1.9210
1993-07-01	3.2966
1993-10-01	1.8519
1994-01-01	1.3690
1994-04-01	1.1418
1994-07-01	1.3162
1994-10-01	1.0319
1995-01-01	2.6929
1995-04-01	2.8355
1995-07-01	1.7909
1995-10-01	1.8852
1996-01-01	0.9640
1996-04-01	1.2581
1996-07-01	1.7565
1996-10-01	1.6576
1997-01-01	1.6232
1997-04-01	0.9831
1997-07-01	0.7140
1997-10-01	0.9628
1998-01-01	1.0852
1998-04-01	0.8178
1998-07-01	2.3418
1998-10-01	1.2331
1999-01-01	1.7810
1999-04-01	1.7666
1999-07-01	1.5323
1999-10-01	1.9217
2000-01-01	1.2363
2000-04-01	1.6185
2000-07-01	1.5639
2000-10-01	2.0588
2001-01-01	3.2205
2001-04-01	2.2905
2001-07-01	2.8311
2001-10-01	2.4728
2002-01-01	2.7388
2002-04-01	1.6943
2002-07-01	1.6888
2002-10-01	1.8574
2003-01-01	3.4450
2003-04-01	4.1865
2003-07-01	3.8533
2003-10-01	5.2684
2004-01-01	6.6140
2004-04-01	5.5957
2004-07-01	5.3058
2004-10-01	6.0379
2005-01-01	5.5896
2005-04-01	4.3585
2005-07-01	4.1999
2005-10-01	4.9317
2006-01-01	4.9163
2006-04-01	5.5641
2006-07-01	4.7156
2006-10-01	6.0438
2007-01-01	6.1740
2007-04-01	6.7065
2007-07-01	5.9927
2007-10-01	3.2681
2008-01-01	5.4613
2008-04-01	7.1390
2008-07-01	10.3047
2008-10-01	21.1349
2009-01-01	21.6971
2009-04-01	21.0849
2009-07-01	21.2534
2009-10-01	17.2875
2010-01-01	17.3272
2010-04-01	12.8763
2010-07-01	14.3056
2010-10-01	11.8743
2011-01-01	10.4247
2011-04-01	8.0434
2011-07-01	7.1872
2011-10-01	7.4115
2012-01-01	8.8357
2012-04-01	7.1105
2012-07-01	7.1104
2012-10-01	7.3923
2013-01-01	6.8698
2013-04-01	7.0589
2013-07-01	7.7922
2013-10-01	6.6416
2014-01-01	5.8362
2014-04-01	5.8677
2014-07-01	6.0811
2014-10-01	6.2900
2015-01-01	5.0800
2015-04-01	5.6792