Quarter	Billions of US Dollars
1987-01-01	0.3343
1987-04-01	0.3097
1987-07-01	0.3041
1987-10-01	0.3454
1988-01-01	0.3346
1988-04-01	0.1932
1988-07-01	0.1117
1988-10-01	0.1125
1989-01-01	0.1066
1989-04-01	0.0562
1989-10-01	0.0250
1990-01-01	0.0500
1990-04-01	0.0340
1990-07-01	0.0150
1990-10-01	0.0050
1991-07-01	0.0300
1991-10-01	0.0300
1992-01-01	0.3350
1992-04-01	1.3850
1992-07-01	1.4520
1992-10-01	1.8410
1993-01-01	2.1320
1993-04-01	3.5010
1993-07-01	4.1660
1993-10-01	5.0589
1994-01-01	5.8138
1994-04-01	6.0304
1994-07-01	6.1309
1994-10-01	7.5611
1995-01-01	7.2931
1995-04-01	7.6781
1995-07-01	8.7949
1995-10-01	9.8749
1996-01-01	10.9348
1996-04-01	12.0394
1996-07-01	11.6221
1996-10-01	12.3131
1997-01-01	12.1424
1997-04-01	12.7066
1997-07-01	14.0115
1997-10-01	12.5079
1998-01-01	14.3989
1998-04-01	15.7409
1998-07-01	14.5593
1998-10-01	13.8219
1999-01-01	11.8656
1999-04-01	12.2109
1999-07-01	12.2968
1999-10-01	12.0552
2000-01-01	12.4357
2000-04-01	12.6699
2000-07-01	12.3518
2000-10-01	11.9805
2001-01-01	11.7749
2001-04-01	12.3914
2001-07-01	11.7563
2001-10-01	12.0643
2002-01-01	11.7463
2002-04-01	11.3284
2002-07-01	11.1530
2002-10-01	10.4914
2003-01-01	12.0849
2003-04-01	12.7334
2003-07-01	12.7489
2003-10-01	11.9133
2004-01-01	11.5600
2004-04-01	10.8972
2004-07-01	10.6053
2004-10-01	9.8741
2005-01-01	9.4915
2005-04-01	9.1559
2005-07-01	9.1570
2005-10-01	9.3558
2006-01-01	9.4448
2006-04-01	8.9178
2006-07-01	9.5428
2006-10-01	9.7357
2007-01-01	9.9143
2007-04-01	11.8182
2007-07-01	12.8609
2007-10-01	13.4669
2008-01-01	15.0949
2008-04-01	14.1841
2008-07-01	12.7815
2008-10-01	11.6544
2009-01-01	11.8072
2009-04-01	13.4716
2009-07-01	14.6224
2009-10-01	16.3476
2010-01-01	20.4267
2010-04-01	22.0918
2010-07-01	23.8306
2010-10-01	28.3966
2011-01-01	32.1823
2011-04-01	37.9121
2011-07-01	37.9567
2011-10-01	38.3524
2012-01-01	39.2269
2012-04-01	38.8728
2012-07-01	38.9931
2012-10-01	41.4000
2013-01-01	41.4927
2013-04-01	40.4414
2013-07-01	41.7688
2013-10-01	39.1420
2014-01-01	41.1671
2014-04-01	41.4249
2014-07-01	44.1659
2014-10-01	43.2212
2015-01-01	39.5302
2015-04-01	38.8184