Quarter	Billions of US Dollars
1989-10-01	5.834
1990-01-01	5.755
1990-04-01	5.626
1990-07-01	5.084
1990-10-01	5.046
1991-01-01	5.046
1991-04-01	5.092
1991-07-01	5.233
1991-10-01	6.713
1992-01-01	7.048
1992-04-01	6.993
1992-07-01	7.122
1992-10-01	9.086
1993-01-01	8.937
1993-04-01	8.361
1993-07-01	7.648
1993-10-01	11.244
1994-01-01	11.172
1994-04-01	11.330
1994-07-01	11.632
1994-10-01	12.174
1995-01-01	11.462
1995-04-01	12.044
1995-07-01	11.950
1995-10-01	12.344
1996-01-01	12.493
1996-04-01	12.665
1996-07-01	12.810
1996-10-01	13.246
1997-01-01	13.178
1997-04-01	12.959
1997-07-01	9.056
1997-10-01	7.963
1998-01-01	8.800
1998-04-01	8.035
1998-07-01	7.660
1998-10-01	9.543
1999-01-01	9.929
1999-04-01	10.526
1999-07-01	9.906
1999-10-01	11.528
2000-01-01	11.333
2000-04-01	10.799
2000-07-01	10.082
2000-10-01	9.346
2001-01-01	9.251
2001-04-01	8.524
2001-07-01	8.488
2001-10-01	8.276
2002-01-01	8.219
2002-04-01	8.238
2002-07-01	7.823
2002-10-01	7.632
2003-01-01	7.994
2003-04-01	8.390
2003-07-01	8.614
2003-10-01	8.925
2004-01-01	9.162
2004-04-01	9.554
2004-07-01	9.890
2004-10-01	10.265
2005-01-01	10.604
2005-04-01	9.980
2005-07-01	11.077
2005-10-01	12.015
2006-01-01	12.529
2006-04-01	11.748
2006-07-01	13.205
2006-10-01	13.475
2007-01-01	13.015
2007-04-01	12.548
2007-07-01	13.727
2007-10-01	14.834
2008-01-01	16.768
2008-04-01	16.564
2008-07-01	16.715
2008-10-01	16.223
2009-01-01	15.857
2009-04-01	14.068
2009-07-01	12.816
2009-10-01	13.423
2010-01-01	12.690
2010-04-01	12.252
2010-07-01	13.174
2010-10-01	12.018
2011-01-01	9.200
2011-04-01	8.768
2011-07-01	9.198
2011-10-01	6.717
2012-01-01	6.222
2012-04-01	6.557
2012-07-01	6.746
2012-10-01	7.032
2013-01-01	7.208
2013-04-01	7.664
2013-07-01	7.410
2013-10-01	7.451
2014-01-01	6.514
2014-04-01	6.589
2014-07-01	6.341
2014-10-01	6.180
2015-01-01	6.211