Quarter	Billions of US Dollars
1987-01-01	0.5670
1987-04-01	0.7720
1987-07-01	1.2320
1987-10-01	1.2440
1988-01-01	1.3870
1988-04-01	1.4280
1988-07-01	1.4650
1988-10-01	1.5360
1989-01-01	1.7660
1989-04-01	1.5790
1989-07-01	1.8880
1989-10-01	1.3130
1990-01-01	1.6160
1990-04-01	1.9030
1990-07-01	2.1350
1990-10-01	1.7250
1991-01-01	2.0750
1991-04-01	2.0790
1991-07-01	2.1820
1991-10-01	2.0020
1992-01-01	2.3370
1992-04-01	2.3170
1992-07-01	2.4420
1992-10-01	3.1920
1993-01-01	1.4240
1993-04-01	1.6750
1993-07-01	6.3439
1993-10-01	7.2486
1994-01-01	5.9835
1994-04-01	6.2367
1994-07-01	5.6421
1994-10-01	4.9016
1995-01-01	6.7018
1995-04-01	6.9096
1995-07-01	7.5846
1995-10-01	7.2543
1996-01-01	8.7463
1996-04-01	9.4025
1996-07-01	8.9214
1996-10-01	11.5320
1997-01-01	9.6899
1997-04-01	9.3941
1997-07-01	9.7217
1997-10-01	10.4189
1998-01-01	8.5089
1998-04-01	9.6958
1998-07-01	10.7453
1998-10-01	11.6606
1999-01-01	13.7298
1999-04-01	16.5404
1999-07-01	15.9826
1999-10-01	15.4823
2000-01-01	17.2720
2000-04-01	19.7373
2000-07-01	20.1364
2000-10-01	22.9592
2001-01-01	24.6664
2001-04-01	20.7025
2001-07-01	18.7713
2001-10-01	18.1604
2002-01-01	16.5761
2002-04-01	17.8444
2002-07-01	15.5680
2002-10-01	15.9782
2003-01-01	17.7465
2003-04-01	17.9918
2003-07-01	16.3581
2003-10-01	19.4984
2004-01-01	15.3355
2004-04-01	13.1795
2004-07-01	13.2708
2004-10-01	12.8600
2005-01-01	11.8370
2005-04-01	10.5943
2005-07-01	11.4995
2005-10-01	12.4894
2006-01-01	14.4446
2006-04-01	16.6529
2006-07-01	18.8022
2006-10-01	20.9060
2007-01-01	27.6958
2007-04-01	25.2171
2007-07-01	41.9843
2007-10-01	44.8589
2008-01-01	62.5277
2008-04-01	73.0270
2008-07-01	74.4481
2008-10-01	61.3772
2009-01-01	82.8534
2009-04-01	87.5323
2009-07-01	85.9498
2009-10-01	87.1950
2010-01-01	81.7007
2010-04-01	65.7620
2010-07-01	76.8870
2010-10-01	60.0713
2011-01-01	62.5806
2011-04-01	56.8093
2011-07-01	39.1030
2011-10-01	25.4084
2012-01-01	41.2117
2012-04-01	26.4948
2012-07-01	20.4345
2012-10-01	16.1110
2013-01-01	17.3092
2013-04-01	17.9139
2013-07-01	18.7545
2013-10-01	15.9922
2014-01-01	20.5246
2014-04-01	20.1942
2014-07-01	20.9653
2014-10-01	19.6231
2015-01-01	24.7685
2015-04-01	20.4107