Quarter	Billions of US Dollars
1987-01-01	1.6410
1987-04-01	1.4210
1987-07-01	1.2600
1987-10-01	1.2000
1988-01-01	1.4380
1988-04-01	1.4950
1988-07-01	1.3010
1988-10-01	1.3790
1989-01-01	1.4300
1989-04-01	1.5700
1989-07-01	1.3710
1989-10-01	1.0710
1990-01-01	1.3200
1990-04-01	1.2630
1990-07-01	1.5170
1990-10-01	2.1390
1991-01-01	0.9370
1991-04-01	1.0080
1991-07-01	1.0880
1991-10-01	1.5910
1992-01-01	1.2870
1992-04-01	1.4260
1992-07-01	2.4430
1992-10-01	2.6230
1993-01-01	3.2150
1993-04-01	4.4280
1993-07-01	9.4970
1993-10-01	9.7068
1994-01-01	10.8772
1994-04-01	9.8535
1994-07-01	9.9823
1994-10-01	8.9245
1995-01-01	4.6054
1995-04-01	4.4455
1995-07-01	6.6879
1995-10-01	7.9017
1996-01-01	8.8586
1996-04-01	10.7408
1996-07-01	10.7235
1996-10-01	12.0292
1997-01-01	10.9406
1997-04-01	9.8148
1997-07-01	10.5394
1997-10-01	8.0023
1998-01-01	10.5914
1998-04-01	11.0471
1998-07-01	7.5391
1998-10-01	6.1724
1999-01-01	4.4819
1999-04-01	5.1744
1999-07-01	5.1093
1999-10-01	5.9323
2000-01-01	6.4000
2000-04-01	6.9215
2000-07-01	6.8409
2000-10-01	5.8129
2001-01-01	5.3687
2001-04-01	5.2342
2001-07-01	3.6923
2001-10-01	4.3078
2002-01-01	3.6354
2002-04-01	3.6299
2002-07-01	4.3879
2002-10-01	4.3785
2003-01-01	6.4004
2003-04-01	6.3234
2003-07-01	6.7018
2003-10-01	5.5563
2004-01-01	4.6405
2004-04-01	3.4478
2004-07-01	3.1530
2004-10-01	3.7940
2005-01-01	3.9811
2005-04-01	4.4320
2005-07-01	4.6636
2005-10-01	5.3368
2006-01-01	7.0322
2006-04-01	7.6851
2006-07-01	10.0049
2006-10-01	11.6624
2007-01-01	12.2362
2007-04-01	13.2386
2007-07-01	13.1915
2007-10-01	12.2182
2008-01-01	14.3221
2008-04-01	15.7646
2008-07-01	16.0137
2008-10-01	6.0864
2009-01-01	6.4812
2009-04-01	8.3411
2009-07-01	9.5033
2009-10-01	9.1650
2010-01-01	8.1281
2010-04-01	7.5682
2010-07-01	7.9092
2010-10-01	6.2061
2011-01-01	6.9052
2011-04-01	6.9537
2011-07-01	7.4473
2011-10-01	8.4917
2012-01-01	10.3051
2012-04-01	11.6239
2012-07-01	12.4147
2012-10-01	12.1219
2013-01-01	12.9495
2013-04-01	14.2331
2013-07-01	16.1647
2013-10-01	17.3836
2014-01-01	17.0240
2014-04-01	18.1607
2014-07-01	18.0811
2014-10-01	19.3340
2015-01-01	20.1937
2015-04-01	22.0321