Quarter	Billions of US Dollars
1987-01-01	1.0233
1987-04-01	1.0814
1987-07-01	1.2837
1987-10-01	1.3171
1988-01-01	1.6011
1988-04-01	1.4961
1988-07-01	1.4943
1988-10-01	1.5114
1989-01-01	1.3771
1989-04-01	1.3340
1989-07-01	1.2061
1989-10-01	1.0918
1990-01-01	1.2842
1990-04-01	1.1535
1990-07-01	1.8088
1990-10-01	1.6328
1991-01-01	1.5557
1991-04-01	1.8036
1991-07-01	1.9414
1991-10-01	1.9389
1992-01-01	2.4806
1992-04-01	2.4502
1992-07-01	1.9904
1992-10-01	1.6349
1993-01-01	1.3079
1993-04-01	1.9949
1993-07-01	1.3590
1993-10-01	1.5172
1994-01-01	1.9151
1994-04-01	2.0152
1994-07-01	1.8106
1994-10-01	1.9166
1995-01-01	1.3547
1995-04-01	1.4340
1995-07-01	1.8440
1995-10-01	2.0581
1996-01-01	1.9342
1996-04-01	1.8227
1996-07-01	2.4431
1996-10-01	2.7435
1997-01-01	3.1041
1997-04-01	3.9363
1997-07-01	4.1907
1997-10-01	4.0628
1998-01-01	4.6999
1998-04-01	5.0242
1998-07-01	5.2277
1998-10-01	5.2259
1999-01-01	5.0267
1999-04-01	5.1563
1999-07-01	5.8332
1999-10-01	5.6313
2000-01-01	5.6106
2000-04-01	6.7527
2000-07-01	6.9534
2000-10-01	7.1196
2001-01-01	7.2723
2001-04-01	8.5973
2001-07-01	10.5188
2001-10-01	10.0314
2002-01-01	10.4235
2002-04-01	10.8931
2002-07-01	11.0089
2002-10-01	10.8465
2003-01-01	11.0643
2003-04-01	11.4168
2003-07-01	11.1539
2003-10-01	11.2432
2004-01-01	11.7485
2004-04-01	12.1087
2004-07-01	13.2523
2004-10-01	15.1173
2005-01-01	15.4855
2005-04-01	15.4602
2005-07-01	17.3846
2005-10-01	17.8405
2006-01-01	17.6444
2006-04-01	19.8436
2006-07-01	20.0448
2006-10-01	19.9141
2007-01-01	20.4307
2007-04-01	23.3877
2007-07-01	23.7860
2007-10-01	23.5060
2008-01-01	23.9403
2008-04-01	24.5444
2008-07-01	24.0710
2008-10-01	23.3386
2009-01-01	23.2668
2009-04-01	22.3375
2009-07-01	23.0905
2009-10-01	24.1755
2010-01-01	24.3615
2010-04-01	23.4002
2010-07-01	25.7374
2010-10-01	26.2174
2011-01-01	27.7544
2011-04-01	29.7399
2011-07-01	30.0581
2011-10-01	32.9108
2012-01-01	37.4590
2012-04-01	36.4237
2012-07-01	37.9584
2012-10-01	40.5186
2013-01-01	42.6339
2013-04-01	47.8369
2013-07-01	52.8104
2013-10-01	56.7692
2014-01-01	57.6752
2014-04-01	62.7760
2014-07-01	63.1501
2014-10-01	59.8121
2015-01-01	56.2116
2015-04-01	56.0946