Quarter	Billions of US Dollars
1987-01-01	1.7229
1987-04-01	1.7100
1987-07-01	1.8342
1987-10-01	2.1188
1988-01-01	2.2072
1988-04-01	2.2534
1988-07-01	2.3251
1988-10-01	2.5447
1989-01-01	2.4377
1989-04-01	2.2617
1989-07-01	2.3306
1989-10-01	2.2817
1990-01-01	2.1148
1990-04-01	2.1652
1990-07-01	2.3294
1990-10-01	2.3840
1991-01-01	2.2755
1991-04-01	2.4398
1991-07-01	2.5229
1991-10-01	2.6783
1992-01-01	2.3897
1992-04-01	2.6332
1992-07-01	2.8287
1992-10-01	2.9825
1993-01-01	2.8377
1993-04-01	3.4368
1993-07-01	5.4265
1993-10-01	5.9105
1994-01-01	6.2438
1994-04-01	7.0888
1994-07-01	7.4811
1994-10-01	7.7086
1995-01-01	7.7954
1995-04-01	8.1837
1995-07-01	8.7753
1995-10-01	8.6610
1996-01-01	8.2467
1996-04-01	8.8820
1996-07-01	10.8333
1996-10-01	11.8462
1997-01-01	12.4083
1997-04-01	14.1485
1997-07-01	15.6079
1997-10-01	15.0447
1998-01-01	15.6947
1998-04-01	15.1732
1998-07-01	14.8168
1998-10-01	14.8637
1999-01-01	14.2920
1999-04-01	13.8089
1999-07-01	13.7425
1999-10-01	13.3370
2000-01-01	13.7621
2000-04-01	13.4676
2000-07-01	12.5966
2000-10-01	13.7353
2001-01-01	12.2606
2001-04-01	12.4829
2001-07-01	11.7482
2001-10-01	12.8476
2002-01-01	12.7083
2002-04-01	16.9639
2002-07-01	17.4483
2002-10-01	19.8702
2003-01-01	19.6939
2003-04-01	20.1138
2003-07-01	21.4734
2003-10-01	21.7433
2004-01-01	22.1473
2004-04-01	22.6989
2004-07-01	23.2701
2004-10-01	24.4542
2005-01-01	25.7506
2005-04-01	25.9884
2005-07-01	26.8734
2005-10-01	26.3126
2006-01-01	29.4261
2006-04-01	29.5578
2006-07-01	29.8185
2006-10-01	32.5034
2007-01-01	32.8440
2007-04-01	34.1306
2007-07-01	34.7277
2007-10-01	34.6612
2008-01-01	36.0963
2008-04-01	38.5383
2008-07-01	38.3599
2008-10-01	38.3869
2009-01-01	37.5843
2009-04-01	35.7369
2009-07-01	42.2724
2009-10-01	42.5701
2010-01-01	41.5560
2010-04-01	41.2245
2010-07-01	43.0881
2010-10-01	42.1289
2011-01-01	45.3920
2011-04-01	46.5731
2011-07-01	46.3009
2011-10-01	47.2023
2012-01-01	48.3950
2012-04-01	50.6411
2012-07-01	51.2948
2012-10-01	56.5723
2013-01-01	56.6958
2013-04-01	63.1154
2013-07-01	65.5417
2013-10-01	68.4395
2014-01-01	70.4716
2014-04-01	72.4134
2014-07-01	71.6354
2014-10-01	73.5342
2015-01-01	77.5426
2015-04-01	86.4281