Quarter	Billions of US Dollars
1987-01-01	0.1440
1987-04-01	0.2380
1987-07-01	0.1230
1987-10-01	0.0630
1988-01-01	0.1690
1988-04-01	0.1440
1988-07-01	0.0590
1988-10-01	0.0630
1989-01-01	0.0510
1989-04-01	0.0480
1989-07-01	0.0560
1989-10-01	0.0540
1990-01-01	0.0360
1990-04-01	0.1010
1990-07-01	0.0910
1990-10-01	0.1020
1991-01-01	0.0640
1991-04-01	0.0770
1991-07-01	0.1110
1991-10-01	0.2480
1992-01-01	0.2850
1992-04-01	0.2710
1992-07-01	0.2130
1992-10-01	0.2390
1993-01-01	0.2500
1993-04-01	0.2490
1993-07-01	0.2495
1993-10-01	0.2170
1994-01-01	0.2482
1997-10-01	0.1767
1998-01-01	0.1722
1998-04-01	0.1753
1998-07-01	0.1875
2004-01-01	0.6356
2004-04-01	0.1459
2004-07-01	0.1489
2004-10-01	0.1705
2005-01-01	0.0070
2005-04-01	2.4254
2006-04-01	4.4940
2007-04-01	8.5473
2007-07-01	5.5298
2007-10-01	1.5163
2008-04-01	11.1325
2008-07-01	6.8368
2008-10-01	7.5669
2009-01-01	6.5737
2009-04-01	12.4046
2009-07-01	16.5784
2009-10-01	2.6783
2010-01-01	0.2426
2010-04-01	0.8590
2010-07-01	2.2519
2010-10-01	5.5452
2011-01-01	3.7649
2011-04-01	2.3847
2011-07-01	2.2280
2011-10-01	14.0919
2012-01-01	19.8083
2012-04-01	9.4776
2012-07-01	5.1313
2012-10-01	3.1437
2013-01-01	0.0155
2013-04-01	9.4695
2013-07-01	9.7736
2013-10-01	20.5720
2014-01-01	23.0977
2014-04-01	19.6429
2014-07-01	16.5026
2014-10-01	18.1253
2015-01-01	25.8778
2015-04-01	46.0261