Quarter	Billions of US Dollars
1987-01-01	0.6744
1987-04-01	0.7085
1987-07-01	0.8110
1987-10-01	0.8841
1988-01-01	1.1295
1988-04-01	1.1840
1988-07-01	1.3494
1988-10-01	1.8863
1989-01-01	2.2509
1989-04-01	2.6625
1989-07-01	2.7196
1989-10-01	2.6874
1990-01-01	2.7356
1990-04-01	3.3562
1990-07-01	3.8207
1990-10-01	4.4838
1991-01-01	4.5324
1991-04-01	4.6441
1991-07-01	5.3221
1991-10-01	5.2601
1992-01-01	4.8537
1992-04-01	5.7059
1992-07-01	5.7288
1992-10-01	5.8216
1993-01-01	5.6810
1993-04-01	5.3807
1993-07-01	7.5992
1993-10-01	6.9166
1994-01-01	7.8071
1994-04-01	7.4363
1994-07-01	7.7296
1994-10-01	7.9904
1995-01-01	7.9070
1995-04-01	7.3487
1995-07-01	7.4168
1995-10-01	6.5051
1996-01-01	7.1427
1996-04-01	8.0174
1996-07-01	7.5438
1996-10-01	8.3969
1997-01-01	9.5218
1997-04-01	10.0042
1997-07-01	9.4859
1997-10-01	9.9449
1998-01-01	8.9553
1998-04-01	8.0270
1998-07-01	8.0420
1998-10-01	8.3643
1999-01-01	7.0504
1999-04-01	7.0450
1999-07-01	7.7178
1999-10-01	7.3715
2000-01-01	6.2470
2000-04-01	6.4957
2000-07-01	6.0425
2000-10-01	5.5752
2001-01-01	4.6711
2001-04-01	4.5120
2001-07-01	4.2813
2001-10-01	4.0721
2002-01-01	4.1722
2002-04-01	4.7404
2002-07-01	4.3896
2002-10-01	4.4502
2003-01-01	4.5857
2003-04-01	5.4275
2003-07-01	5.2659
2003-10-01	5.7863
2004-01-01	6.4338
2004-04-01	8.1447
2004-07-01	8.7172
2004-10-01	10.3405
2005-01-01	10.7602
2005-04-01	10.4471
2005-07-01	10.9661
2005-10-01	10.3286
2006-01-01	11.9294
2006-04-01	13.0736
2006-07-01	12.5796
2006-10-01	13.5985
2007-01-01	13.2709
2007-04-01	13.2334
2007-07-01	13.8163
2007-10-01	13.6548
2008-01-01	15.0732
2008-04-01	15.1139
2008-07-01	15.2693
2008-10-01	15.7691
2009-01-01	14.8485
2009-04-01	17.7310
2009-07-01	18.9842
2009-10-01	18.8871
2010-01-01	19.6876
2010-04-01	19.4876
2010-07-01	22.3725
2010-10-01	24.6285
2011-01-01	28.0653
2011-04-01	29.5454
2011-07-01	27.8192
2011-10-01	28.7031
2012-01-01	30.2225
2012-04-01	32.7504
2012-07-01	33.7956
2012-10-01	33.7757
2013-01-01	36.0341
2013-04-01	38.0539
2013-07-01	41.0500
2013-10-01	44.9590
2014-01-01	45.7568
2014-04-01	50.5679
2014-07-01	51.1383
2014-10-01	48.9076
2015-01-01	46.9743
2015-04-01	51.4169