Quarter	Billions of US Dollars
1987-01-01	2.8140
1987-04-01	3.4530
1987-07-01	3.8190
1987-10-01	3.7430
1988-01-01	4.1920
1988-04-01	4.5360
1988-07-01	4.3890
1988-10-01	3.7560
1989-01-01	4.3880
1989-04-01	4.3290
1989-07-01	4.6870
1989-10-01	3.6320
1990-01-01	4.7720
1990-04-01	5.7970
1990-07-01	7.2490
1990-10-01	6.3160
1991-01-01	5.6980
1991-04-01	4.6680
1991-07-01	5.1740
1991-10-01	4.7710
1992-01-01	4.7700
1992-04-01	5.1640
1992-07-01	6.2230
1992-10-01	8.0550
1993-01-01	7.1290
1993-04-01	8.1140
1993-07-01	9.9204
1993-10-01	9.7424
1994-01-01	10.1715
1994-04-01	10.0108
1994-07-01	10.2542
1994-10-01	10.7293
1995-01-01	8.4958
1995-04-01	8.6569
1995-07-01	8.9376
1995-10-01	8.6157
1996-01-01	8.2080
1996-04-01	12.8144
1996-07-01	7.5737
1996-10-01	8.8341
1997-01-01	7.3958
1997-04-01	8.5368
1997-07-01	8.6228
1997-10-01	8.4760
1998-01-01	7.6036
1998-04-01	10.5051
1998-07-01	11.2040
1998-10-01	11.4569
1999-01-01	11.9774
1999-04-01	12.2833
1999-07-01	15.4464
1999-10-01	13.1677
2000-01-01	14.7272
2000-04-01	13.8824
2000-07-01	14.5384
2000-10-01	18.9897
2001-01-01	16.4103
2001-04-01	15.2393
2001-07-01	14.0107
2001-10-01	12.2052
2002-01-01	11.3788
2002-04-01	11.0548
2002-07-01	12.7664
2002-10-01	12.6527
2003-01-01	12.8014
2003-04-01	10.5337
2003-07-01	9.6343
2003-10-01	10.3528
2004-01-01	13.4152
2004-04-01	13.4517
2004-07-01	14.4743
2004-10-01	16.5746
2005-01-01	16.6180
2005-04-01	21.3632
2005-07-01	20.3207
2005-10-01	19.8469
2006-01-01	21.9522
2006-04-01	21.7912
2006-07-01	20.5591
2006-10-01	21.1757
2007-01-01	24.2207
2007-04-01	28.3918
2007-07-01	28.4795
2007-10-01	35.8059
2008-01-01	39.5322
2008-04-01	45.6732
2008-07-01	52.1678
2008-10-01	39.5516
2009-01-01	41.4685
2009-04-01	46.6308
2009-07-01	49.6732
2009-10-01	46.2644
2010-01-01	51.0899
2010-04-01	45.4804
2010-07-01	46.9225
2010-10-01	47.8248
2011-01-01	40.2673
2011-04-01	42.2166
2011-07-01	51.3948
2011-10-01	53.0190
2012-01-01	51.5137
2012-04-01	51.5360
2012-07-01	54.0795
2012-10-01	53.9607
2013-01-01	57.0632
2013-04-01	49.5504
2013-07-01	52.7386
2013-10-01	42.4282
2014-01-01	38.0495
2014-04-01	48.0535
2014-07-01	46.2849
2014-10-01	51.9858
2015-01-01	37.8535
2015-04-01	36.2061