Quarter	Billions of US Dollars
1987-01-01	0.8170
1987-04-01	0.8242
1987-07-01	0.7733
1987-10-01	1.0030
1988-01-01	0.9016
1988-04-01	0.8862
1988-07-01	1.0114
1988-10-01	1.0667
1989-01-01	1.0634
1989-04-01	1.1410
1989-07-01	1.1661
1989-10-01	1.2508
1990-01-01	1.2437
1990-04-01	1.2703
1990-07-01	1.3302
1990-10-01	1.3552
1991-01-01	1.5084
1991-04-01	1.4596
1991-07-01	1.4453
1991-10-01	1.5259
1992-01-01	1.4211
1992-04-01	1.5287
1992-07-01	1.6042
1992-10-01	1.3102
1993-01-01	1.1530
1993-04-01	1.0499
1993-07-01	3.1977
1993-10-01	3.1516
1994-01-01	3.3527
1994-04-01	3.3465
1994-07-01	3.3963
1994-10-01	3.2105
1995-01-01	3.2902
1995-04-01	3.2906
1995-07-01	3.2048
1995-10-01	3.1711
1996-01-01	3.2984
1996-04-01	3.1754
1996-07-01	3.1697
1996-10-01	3.0601
1997-01-01	2.9635
1997-04-01	3.1247
1997-07-01	3.1556
1997-10-01	3.1408
1998-01-01	3.1359
1998-04-01	3.1190
1998-07-01	3.1307
1998-10-01	3.1710
1999-01-01	3.2572
1999-04-01	3.2553
1999-07-01	3.2994
1999-10-01	3.1207
2000-01-01	3.1139
2000-04-01	3.0398
2000-07-01	3.0354
2000-10-01	3.0241
2001-01-01	2.8500
2001-04-01	2.8500
2001-07-01	2.8500
2001-10-01	2.8500
2002-01-01	2.8500
2002-04-01	2.8500
2002-07-01	2.6000
2002-10-01	2.6000
2003-01-01	2.4500
2003-04-01	2.4500
2003-07-01	2.4500
2003-10-01	2.7500
2004-01-01	3.0500
2004-04-01	2.8000
2004-07-01	3.3500
2004-10-01	4.0000
2005-01-01	4.0000
2005-04-01	4.0250
2005-07-01	4.1454
2005-10-01	5.0530
2006-01-01	5.2660
2006-04-01	5.2827
2006-07-01	6.0228
2006-10-01	7.5517
2007-01-01	12.0402
2007-04-01	14.4475
2007-07-01	14.2535
2007-10-01	16.2810
2008-01-01	16.6265
2008-04-01	16.6541
2008-07-01	16.5235
2008-10-01	16.1958
2009-01-01	14.9536
2009-04-01	15.1294
2009-07-01	14.8058
2009-10-01	15.7190
2010-01-01	16.0772
2010-04-01	15.7493
2010-07-01	16.6621
2010-10-01	18.4416
2011-01-01	21.2158
2011-04-01	24.5733
2011-07-01	24.4634
2011-10-01	22.5271
2012-01-01	25.1878
2012-04-01	25.4208
2012-07-01	28.4766
2012-10-01	28.4088
2013-01-01	29.1468
2013-04-01	31.5868
2013-07-01	32.3499
2013-10-01	34.2351
2014-01-01	35.3272
2014-04-01	38.5455
2014-07-01	39.3501
2014-10-01	39.9494
2015-01-01	39.4967
2015-04-01	41.1125