Quarter	Billions of US Dollars
1987-01-01	0.288
1987-04-01	0.435
1987-07-01	0.434
1987-10-01	0.475
1988-01-01	0.460
1988-04-01	0.437
1988-07-01	0.427
1988-10-01	0.440
1989-01-01	0.422
1989-04-01	0.418
1989-07-01	0.427
1989-10-01	0.394
1990-01-01	0.398
1990-04-01	0.405
1990-07-01	0.425
1990-10-01	0.433
1991-01-01	0.398
1991-04-01	0.509
1991-07-01	0.684
1991-10-01	0.705
1992-01-01	0.682
1992-04-01	0.703
1992-07-01	0.730
1992-10-01	0.688
1993-01-01	0.685
1993-04-01	0.827
1993-07-01	1.728
1993-10-01	3.522
1994-01-01	5.145
1994-04-01	5.719
1994-07-01	6.004
1994-10-01	8.034
1995-01-01	8.362
1995-04-01	8.419
1995-07-01	8.320
1995-10-01	8.574
1996-01-01	8.626
1996-04-01	9.405
1996-07-01	9.852
1996-10-01	10.422
1997-01-01	11.934
1997-04-01	13.885
1997-07-01	16.554
1997-10-01	16.320
1998-01-01	16.201
1998-04-01	16.237
1998-07-01	15.438
1998-10-01	14.406
1999-01-01	16.611
1999-04-01	16.921
1999-07-01	16.870
1999-10-01	16.208
2000-01-01	16.399
2000-04-01	15.804
2000-07-01	20.146
2000-10-01	20.179
2001-01-01	23.766
2001-04-01	24.587
2001-07-01	24.592
2001-10-01	24.235
2002-01-01	23.225
2002-04-01	22.937
2002-07-01	23.094
2002-10-01	23.041
2003-01-01	24.522
2003-04-01	25.824
2003-07-01	25.240
2003-10-01	30.514
2004-01-01	29.322
2004-04-01	29.335
2004-07-01	29.260
2004-10-01	30.872
2005-01-01	32.013
2005-04-01	33.102
2005-07-01	34.891
2005-10-01	35.650
2006-01-01	35.187
2006-04-01	36.153
2006-07-01	37.541
2006-10-01	40.369
2007-01-01	39.973
2007-04-01	42.474
2007-07-01	41.766
2007-10-01	42.511
2008-01-01	43.711
2008-04-01	46.127
2008-07-01	46.389
2008-10-01	44.871
2009-01-01	43.627
2009-04-01	44.584
2009-07-01	50.154
2009-10-01	52.365
2010-01-01	52.436
2010-04-01	51.417
2010-07-01	55.502
2010-10-01	57.539
2011-01-01	56.930
2011-04-01	58.397
2011-07-01	59.204
2011-10-01	58.901
2012-01-01	70.589
2012-04-01	77.488
2012-07-01	80.133
2012-10-01	83.593
2013-01-01	85.094
2013-04-01	89.489
2013-07-01	88.653
2013-10-01	89.381
2014-01-01	93.173
2014-04-01	93.596
2014-07-01	95.979
2014-10-01	100.162
2015-01-01	100.664
2015-04-01	101.248