Quarter	Billions of US Dollars
1987-01-01	5.378
1987-04-01	5.505
1987-07-01	5.590
1987-10-01	6.002
1988-01-01	5.962
1988-04-01	6.539
1988-07-01	6.846
1988-10-01	6.843
1989-01-01	6.029
1989-04-01	6.645
1989-07-01	7.990
1989-10-01	8.293
1990-01-01	9.661
1990-04-01	10.199
1990-07-01	11.285
1990-10-01	11.541
1991-01-01	12.502
1991-04-01	12.500
1991-07-01	14.253
1991-10-01	16.842
1992-01-01	17.997
1992-04-01	20.166
1992-07-01	23.035
1992-10-01	23.034
1993-01-01	24.253
1993-04-01	26.695
1993-07-01	18.302
1993-10-01	19.797
1994-01-01	23.364
1994-04-01	25.276
1994-07-01	30.524
1994-10-01	32.937
1995-01-01	37.597
1995-04-01	39.953
1995-07-01	41.497
1995-10-01	43.734
1996-01-01	47.880
1996-04-01	53.292
1996-07-01	55.614
1996-10-01	58.547
1997-01-01	59.825
1997-04-01	61.927
1997-07-01	64.570
1997-10-01	65.790
1998-01-01	69.300
1998-04-01	72.018
1998-07-01	82.625
1998-10-01	90.493
1999-01-01	95.217
1999-04-01	101.434
1999-07-01	113.551
1999-10-01	111.287
2000-01-01	114.655
2000-04-01	120.841
2000-07-01	116.351
2000-10-01	125.180
2001-01-01	127.956
2001-04-01	132.061
2001-07-01	138.730
2001-10-01	140.823
2002-01-01	147.204
2002-04-01	171.372
2002-07-01	174.949
2002-10-01	189.326
2003-01-01	209.700
2003-04-01	228.900
2003-07-01	242.158
2003-10-01	267.791
2004-01-01	276.784
2004-04-01	287.069
2004-07-01	297.743
2004-10-01	332.480
2005-01-01	341.053
2005-04-01	335.034
2005-07-01	337.411
2005-10-01	336.831
2006-01-01	359.331
2006-04-01	387.528
2006-07-01	394.620
2006-10-01	410.850
2007-01-01	427.619
2007-04-01	445.935
2007-07-01	469.398
2007-10-01	485.605
2008-01-01	525.259
2008-04-01	532.034
2008-07-01	483.071
2008-10-01	468.026
2009-01-01	468.511
2009-04-01	534.233
2009-07-01	556.974
2009-10-01	562.256
2010-01-01	576.077
2010-04-01	528.051
2010-07-01	609.130
2010-10-01	617.831
2011-01-01	664.134
2011-04-01	691.799
2011-07-01	660.054
2011-10-01	647.207
2012-01-01	677.473
2012-04-01	650.225
2012-07-01	674.569
2012-10-01	664.483
2013-01-01	638.544
2013-04-01	652.961
2013-07-01	678.038
2013-10-01	675.989
2014-01-01	666.133
2014-04-01	658.166
2014-07-01	623.282
2014-10-01	600.655
2015-01-01	566.286
2015-04-01	575.630