Quarter	Billions of US Dollars
1987-01-01	0.5534
1987-04-01	0.6411
1987-07-01	0.6926
1987-10-01	0.7709
1988-01-01	0.8228
1988-04-01	0.9395
1988-07-01	0.8912
1988-10-01	0.9888
1989-01-01	1.1285
1989-04-01	1.1047
1989-07-01	1.1281
1989-10-01	1.2359
1990-01-01	1.2484
1990-04-01	1.4220
1990-07-01	1.4340
1990-10-01	1.6093
1991-01-01	1.3365
1991-04-01	1.2406
1991-07-01	1.3689
1991-10-01	1.5087
1992-01-01	1.6580
1992-04-01	1.8718
1992-07-01	2.0461
1992-10-01	1.7374
1993-01-01	1.8359
1993-04-01	1.8633
1993-07-01	2.5264
1993-10-01	2.6531
1994-01-01	2.6634
1994-04-01	2.7495
1994-07-01	2.8686
1994-10-01	2.7477
1995-01-01	2.9903
1995-04-01	3.0074
1995-07-01	2.9609
1995-10-01	2.8722
1996-01-01	2.9084
1996-04-01	3.2654
1996-07-01	3.2335
1996-10-01	3.0563
1997-01-01	2.6531
1997-04-01	2.8111
1997-07-01	2.8797
1997-10-01	2.8251
1998-01-01	2.8059
1998-04-01	3.2548
1998-07-01	3.2940
1998-10-01	3.9914
1999-01-01	4.2233
1999-04-01	4.3830
1999-07-01	4.7927
1999-10-01	4.9198
2000-01-01	5.3315
2000-04-01	5.9161
2000-07-01	5.7460
2000-10-01	6.5859
2001-01-01	7.5512
2001-04-01	7.6701
2001-07-01	7.7803
2001-10-01	7.8437
2002-01-01	7.5578
2002-04-01	8.7948
2002-07-01	8.3824
2002-10-01	8.9903
2003-01-01	9.5615
2003-04-01	10.5664
2003-07-01	11.5990
2003-10-01	14.1840
2004-01-01	15.2581
2004-04-01	16.6405
2004-07-01	19.4954
2004-10-01	24.1176
2005-01-01	27.3398
2005-04-01	30.3607
2005-07-01	33.7955
2005-10-01	38.5054
2006-01-01	40.9647
2006-04-01	43.4212
2006-07-01	45.3218
2006-10-01	51.8997
2007-01-01	56.2310
2007-04-01	57.3433
2007-07-01	58.5264
2007-10-01	60.5672
2008-01-01	63.4216
2008-04-01	62.0809
2008-07-01	55.1817
2008-10-01	51.1811
2009-01-01	46.4891
2009-04-01	46.0951
2009-07-01	47.6215
2009-10-01	44.2084
2010-01-01	40.6956
2010-04-01	38.3374
2010-07-01	37.6923
2010-10-01	34.2563
2011-01-01	34.2015
2011-04-01	32.1106
2011-07-01	28.8436
2011-10-01	25.9383
2012-01-01	23.5305
2012-04-01	21.0122
2012-07-01	17.2917
2012-10-01	15.2279
2013-01-01	12.7363
2013-04-01	10.9965
2013-07-01	10.8402
2013-10-01	10.6970
2014-01-01	10.7512
2014-04-01	10.3943
2014-07-01	9.9312
2014-10-01	9.4457
2015-01-01	8.8581
2015-04-01	8.8303