Quarter	Billions of US Dollars
1987-01-01	0.3967
1987-04-01	0.3935
1987-07-01	0.4900
1987-10-01	0.5629
1988-01-01	0.5347
1988-04-01	0.4947
1988-07-01	0.5713
1988-10-01	0.6822
1989-01-01	0.6343
1989-04-01	0.6259
1989-07-01	0.6458
1989-10-01	0.6812
1990-01-01	0.8712
1990-04-01	1.0391
1990-07-01	1.1160
1990-10-01	1.4765
1991-01-01	1.4680
1991-04-01	1.3951
1991-07-01	1.5430
1991-10-01	2.0349
1992-01-01	2.0826
1992-04-01	2.4176
1992-07-01	2.6623
1992-10-01	2.5659
1993-01-01	2.8049
1993-04-01	2.9827
1993-07-01	3.0479
1993-10-01	3.4192
1994-01-01	3.5030
1994-04-01	3.7373
1994-07-01	3.7887
1994-10-01	3.9192
1995-01-01	4.6043
1995-04-01	4.3986
1995-07-01	4.6681
1995-10-01	5.2493
1996-01-01	4.9673
1996-04-01	5.0666
1996-07-01	5.1264
1996-10-01	5.1124
1997-01-01	5.0772
1997-04-01	5.0529
1997-07-01	5.1710
1997-10-01	4.9935
1998-01-01	4.8372
1998-04-01	4.8965
1998-07-01	5.1997
1998-10-01	5.2325
1999-01-01	5.0392
1999-04-01	5.0476
1999-07-01	5.1793
1999-10-01	5.0406
2000-01-01	4.6440
2000-04-01	4.6788
2000-07-01	4.4692
2000-10-01	5.0848
2001-01-01	4.8766
2001-04-01	4.8434
2001-07-01	5.6946
2001-10-01	7.6241
2002-01-01	7.5018
2002-04-01	8.8578
2002-07-01	9.2871
2002-10-01	10.2399
2003-01-01	10.4401
2003-04-01	11.7174
2003-07-01	14.1848
2003-10-01	16.3974
2004-01-01	16.8978
2004-04-01	18.2966
2004-07-01	19.4951
2004-10-01	23.5593
2005-01-01	22.8725
2005-04-01	23.4258
2005-07-01	23.1566
2005-10-01	23.0622
2006-01-01	25.4004
2006-04-01	27.0389
2006-07-01	29.9986
2006-10-01	34.3713
2007-01-01	40.3509
2007-04-01	42.1531
2007-07-01	44.1084
2007-10-01	43.7221
2008-01-01	47.0030
2008-04-01	47.0055
2008-07-01	42.8160
2008-10-01	42.8411
2009-01-01	41.7115
2009-04-01	44.1857
2009-07-01	45.7100
2009-10-01	45.1829
2010-01-01	42.5858
2010-04-01	39.2724
2010-07-01	43.0918
2010-10-01	41.6486
2011-01-01	43.2679
2011-04-01	43.3637
2011-07-01	39.7917
2011-10-01	37.2007
2012-01-01	37.9215
2012-04-01	36.1694
2012-07-01	34.4396
2012-10-01	34.0721
2013-01-01	32.3407
2013-04-01	32.9172
2013-07-01	32.6509
2013-10-01	32.1994
2014-01-01	30.6224
2014-04-01	28.7178
2014-07-01	26.7779
2014-10-01	25.6822
2015-01-01	22.0236
2015-04-01	21.6943