Quarter	Billions of US Dollars
1987-01-01	1.1720
1987-04-01	1.5610
1987-07-01	2.4170
1987-10-01	2.2830
1988-01-01	2.4110
1988-04-01	2.3570
1988-07-01	3.1110
1988-10-01	2.3370
1989-01-01	2.9950
1989-04-01	2.4610
1989-07-01	2.7900
1989-10-01	2.2560
1990-01-01	2.6240
1990-04-01	3.6990
1990-07-01	4.0340
1990-10-01	3.3230
1991-01-01	4.2590
1991-04-01	3.3110
1991-07-01	3.1990
1991-10-01	2.4070
1992-01-01	2.5440
1992-04-01	2.3700
1992-07-01	1.8780
1992-10-01	1.5180
1993-01-01	1.0240
1993-04-01	1.4650
1993-07-01	2.2591
1993-10-01	2.0083
1994-01-01	2.1080
1994-04-01	1.9139
1994-07-01	2.3080
1994-10-01	1.7003
1995-01-01	1.6706
1995-04-01	1.3592
1995-07-01	1.9268
1995-10-01	1.6373
1996-01-01	1.5334
1996-04-01	1.5629
1996-07-01	1.1952
1996-10-01	1.9501
1997-01-01	1.6009
1997-04-01	1.5560
1997-07-01	1.2457
1997-10-01	2.0128
1998-01-01	1.4518
1998-04-01	0.7936
1998-07-01	0.9249
1998-10-01	1.0342
1999-01-01	0.8459
1999-04-01	1.1433
1999-07-01	2.3211
1999-10-01	2.1794
2000-01-01	1.1817
2000-04-01	1.2539
2000-07-01	0.7481
2000-10-01	1.7728
2001-01-01	1.7364
2001-04-01	1.8396
2001-07-01	1.6582
2001-10-01	1.6194
2002-01-01	1.7863
2002-04-01	1.1951
2002-07-01	1.9142
2002-10-01	3.1954
2003-01-01	3.1541
2003-04-01	1.7974
2003-07-01	2.3296
2003-10-01	2.1801
2004-01-01	3.3276
2004-04-01	3.9023
2004-07-01	3.1387
2004-10-01	6.5964
2005-01-01	5.6384
2005-04-01	4.9593
2005-07-01	5.5863
2005-10-01	6.1548
2006-01-01	8.7914
2006-04-01	8.4534
2006-07-01	7.3381
2006-10-01	5.9677
2007-01-01	7.2633
2007-04-01	8.5496
2007-07-01	7.9498
2007-10-01	6.2516
2008-01-01	5.5655
2008-04-01	8.3582
2008-07-01	8.7793
2008-10-01	10.1293
2009-01-01	12.4274
2009-04-01	14.8486
2009-07-01	15.6144
2009-10-01	15.6176
2010-01-01	14.2960
2010-04-01	13.5713
2010-07-01	16.1526
2010-10-01	17.3064
2011-01-01	15.5025
2011-04-01	15.4649
2011-07-01	14.4106
2011-10-01	13.2384
2012-01-01	12.2269
2012-04-01	13.2660
2012-07-01	14.6088
2012-10-01	10.8093
2013-01-01	12.6583
2013-04-01	12.6558
2013-07-01	11.1672
2013-10-01	10.4091
2014-01-01	11.5929
2014-04-01	12.3639
2014-07-01	9.8474
2014-10-01	10.5519
2015-01-01	9.1626
2015-04-01	8.6750