Quarter	Billions of US Dollars
1987-01-01	0.1029
1987-04-01	0.1020
1987-07-01	0.1025
1987-10-01	0.1215
1988-01-01	0.1196
1988-04-01	0.1133
1988-07-01	0.1115
1988-10-01	0.1192
1989-01-01	0.1136
1989-04-01	0.1041
1989-07-01	0.1077
1989-10-01	0.1046
1990-01-01	0.0954
1990-04-01	0.0981
1990-07-01	0.1089
1990-10-01	0.1116
1991-01-01	0.1064
1991-04-01	0.1088
1991-07-01	0.1129
1991-10-01	0.1198
1992-01-01	0.1126
1992-04-01	0.1195
1992-07-01	0.1258
1992-10-01	0.1202
1993-01-01	0.1289
1993-04-01	0.1405
1993-07-01	0.1427
1993-10-01	0.2341
1994-01-01	0.2454
1994-04-01	0.2514
1994-07-01	0.2524
1994-10-01	0.2003
1995-01-01	0.2119
1995-04-01	0.2182
1995-07-01	0.2509
1995-10-01	0.3986
1996-01-01	0.4470
1996-04-01	0.4200
1996-07-01	0.5700
1996-10-01	0.5700
1997-01-01	0.5700
1997-04-01	0.5700
1997-07-01	0.8200
1997-10-01	0.8600
1998-01-01	1.2900
1998-04-01	1.2900
1998-07-01	1.2900
1998-10-01	1.2900
1999-01-01	1.2900
1999-04-01	1.2900
1999-07-01	1.4156
1999-10-01	1.4156
2000-01-01	2.0022
2000-04-01	2.0023
2000-07-01	1.4227
2000-10-01	1.4231
2001-01-01	1.4227
2001-04-01	1.4076
2001-07-01	1.2521
2001-10-01	1.2519
2002-01-01	1.2470
2002-04-01	1.3480
2002-07-01	1.2479
2002-10-01	0.6600
2003-01-01	0.5900
2003-04-01	0.5900
2003-07-01	0.5900
2003-10-01	0.5900
2004-01-01	0.5900
2004-04-01	0.4900
2004-07-01	0.3000
2004-10-01	0.3000
2005-01-01	0.4211
2005-04-01	0.4178
2005-07-01	0.9149
2005-10-01	0.9102
2006-01-01	1.6357
2006-04-01	1.6381
2006-07-01	1.5354
2006-10-01	1.6343
2007-01-01	1.7630
2007-04-01	1.7522
2007-07-01	1.7684
2007-10-01	1.9619
2008-01-01	1.9960
2008-04-01	1.9795
2008-07-01	1.9848
2008-10-01	3.0248
2009-01-01	2.8104
2009-04-01	2.8168
2009-07-01	2.7369
2009-10-01	2.7291
2010-01-01	1.8609
2010-04-01	1.8693
2010-07-01	1.3799
2010-10-01	2.8842
2011-01-01	3.5804
2011-04-01	4.0358
2011-07-01	4.2457
2011-10-01	4.2680
2012-01-01	5.9542
2012-04-01	6.0390
2012-07-01	6.0455
2012-10-01	6.3486
2013-01-01	7.3369
2013-04-01	10.2409
2013-07-01	10.2671
2013-10-01	11.3024
2014-01-01	12.5470
2014-04-01	14.8609
2014-07-01	16.8070
2014-10-01	16.9778
2015-01-01	16.9142
2015-04-01	17.1525