Quarter	Billions of US Dollars
1987-01-01	0.18280
1987-04-01	0.17658
1987-07-01	0.17451
1987-10-01	0.20133
1988-01-01	0.19826
1988-04-01	0.23401
1988-07-01	0.23119
1988-10-01	0.23924
1989-01-01	0.23128
1989-04-01	0.19357
1989-07-01	0.14605
1989-10-01	0.14201
1990-01-01	0.12990
1990-04-01	0.06822
1990-07-01	0.07257
1990-10-01	0.07440
1991-01-01	0.07092
1991-04-01	0.07252
1991-07-01	0.07527
1991-10-01	0.07987
1992-01-01	0.07508
1992-04-01	0.07968
1992-07-01	0.08389
1992-10-01	0.08016
1993-01-01	0.08595
1993-04-01	0.09368
1993-07-01	0.09510
1993-10-01	0.08941
1994-01-01	0.09695
1996-04-01	0.05182
1996-07-01	0.06785
1996-10-01	0.06785
1997-01-01	0.06785
1997-04-01	0.06151
1997-07-01	0.06151
1997-10-01	0.05643
1998-01-01	0.05643
1998-04-01	0.05671
1998-07-01	0.06893
1998-10-01	0.06893
1999-01-01	0.06893
1999-04-01	0.06893
1999-07-01	0.06893
1999-10-01	0.06893
2000-01-01	0.06893
2000-04-01	0.06893
2000-07-01	0.04450
2000-10-01	0.04450
2001-01-01	0.04473
2001-04-01	0.04803
2001-07-01	0.04631
2001-10-01	0.04584
2002-01-01	0.04584
2002-04-01	0.04701
2002-07-01	0.04882
2002-10-01	0.04957
2003-01-01	0.04938
2003-04-01	0.05184
2003-07-01	0.05184
2003-10-01	0.05184
2004-01-01	0.05449
2004-04-01	0.05742
2004-07-01	0.05742
2004-10-01	0.05742
2005-01-01	0.05742
2005-04-01	0.05742
2005-07-01	0.05742
2005-10-01	0.23263
2006-01-01	0.23364
2006-04-01	0.24268
2006-07-01	0.15953
2006-10-01	0.16389
2007-01-01	0.16377
2007-04-01	0.16305
2007-07-01	0.17094
2007-10-01	0.17770
2008-01-01	0.20123
2008-04-01	0.19652
2008-07-01	0.18154
2008-10-01	0.18802
2009-01-01	0.17569
2009-04-01	0.18513
2009-07-01	0.19436
2009-10-01	0.19408
2010-01-01	0.18864
2010-04-01	0.18498
2010-07-01	0.20555
2010-10-01	0.21286
2011-01-01	0.21863
2011-04-01	0.23969
2011-07-01	0.22188
2011-10-01	0.21256
2012-01-01	0.22146
2012-04-01	0.20934
2012-07-01	0.21379
2012-10-01	0.21820
2013-01-01	0.21006
2013-04-01	0.21249
2013-07-01	0.22095