Quarter	Billions of US Dollars
1987-01-01	4.410
1987-04-01	4.357
1987-07-01	4.451
1987-10-01	5.394
1988-01-01	5.886
1988-04-01	5.798
1988-07-01	5.973
1988-10-01	6.614
1989-01-01	6.624
1989-04-01	6.308
1989-07-01	6.850
1989-10-01	7.078
1990-01-01	7.016
1990-04-01	7.807
1990-07-01	8.585
1990-10-01	9.489
1991-01-01	9.811
1991-04-01	9.859
1991-07-01	10.402
1991-10-01	12.408
1992-01-01	12.353
1992-04-01	13.178
1992-07-01	14.325
1992-10-01	14.164
1993-01-01	15.422
1993-04-01	17.241
1993-07-01	22.378
1993-10-01	24.530
1994-01-01	27.832
1994-04-01	30.222
1994-07-01	32.486
1994-10-01	33.875
1995-01-01	34.969
1995-04-01	36.798
1995-07-01	37.436
1995-10-01	37.630
1996-01-01	38.444
1996-04-01	41.661
1996-07-01	44.564
1996-10-01	47.202
1997-01-01	47.306
1997-04-01	54.565
1997-07-01	61.189
1997-10-01	63.704
1998-01-01	64.268
1998-04-01	67.414
1998-07-01	69.230
1998-10-01	72.643
1999-01-01	71.684
1999-04-01	71.654
1999-07-01	74.443
1999-10-01	74.300
2000-01-01	75.102
2000-04-01	72.136
2000-07-01	69.919
2000-10-01	70.642
2001-01-01	69.351
2001-04-01	69.884
2001-07-01	72.471
2001-10-01	74.976
2002-01-01	77.757
2002-04-01	86.715
2002-07-01	90.227
2002-10-01	97.029
2003-01-01	98.917
2003-04-01	103.614
2003-07-01	113.150
2003-10-01	119.286
2004-01-01	123.601
2004-04-01	126.675
2004-07-01	132.185
2004-10-01	142.321
2005-01-01	147.234
2005-04-01	151.194
2005-07-01	157.736
2005-10-01	163.029
2006-01-01	176.493
2006-04-01	186.407
2006-07-01	194.480
2006-10-01	225.430
2007-01-01	242.258
2007-04-01	265.921
2007-07-01	272.337
2007-10-01	289.441
2008-01-01	290.689
2008-04-01	306.701
2008-07-01	308.415
2008-10-01	298.647
2009-01-01	291.914
2009-04-01	301.948
2009-07-01	323.093
2009-10-01	336.476
2010-01-01	335.174
2010-04-01	333.452
2010-07-01	362.850
2010-10-01	385.520
2011-01-01	411.881
2011-04-01	430.729
2011-07-01	425.878
2011-10-01	434.835
2012-01-01	459.730
2012-04-01	470.738
2012-07-01	487.495
2012-10-01	516.604
2013-01-01	536.983
2013-04-01	584.949
2013-07-01	598.920
2013-10-01	626.131
2014-01-01	652.121
2014-04-01	695.387
2014-07-01	701.327
2014-10-01	722.772
2015-01-01	738.327
2015-04-01	787.880