Quarter	Billions of US Dollars
1987-01-01	0.7674
1987-04-01	0.7444
1987-07-01	0.7151
1987-10-01	0.7678
1988-01-01	0.6263
1988-04-01	0.5998
1988-07-01	0.5891
1988-10-01	0.6061
1989-01-01	0.5090
1989-04-01	0.4999
1989-07-01	0.5071
1989-10-01	0.5155
1990-01-01	0.4228
1990-04-01	1.0260
1990-07-01	1.1445
1990-10-01	1.3960
1991-01-01	2.3114
1991-04-01	2.2333
1991-07-01	2.2436
1991-10-01	2.5453
1992-01-01	2.5330
1992-04-01	2.5996
1992-07-01	2.6078
1992-10-01	2.7341
1993-01-01	2.7341
1993-04-01	3.0025
1993-07-01	3.1851
1993-10-01	3.7084
1994-01-01	4.2027
1994-04-01	5.0732
1994-07-01	5.9195
1994-10-01	6.1016
1995-01-01	5.7559
1995-04-01	5.5966
1995-07-01	5.7656
1995-10-01	5.7886
1996-01-01	5.8006
1996-04-01	6.1644
1996-07-01	7.0464
1996-10-01	6.8496
1997-01-01	7.3458
1997-04-01	9.0942
1997-07-01	9.5934
1997-10-01	9.5720
1998-01-01	9.5096
1998-04-01	10.6037
1998-07-01	11.3987
1998-10-01	11.1891
1999-01-01	10.4885
1999-04-01	10.3524
1999-07-01	10.1394
1999-10-01	10.3448
2000-01-01	10.2684
2000-04-01	10.1866
2000-07-01	8.8445
2000-10-01	8.6931
2001-01-01	8.6974
2001-04-01	8.4731
2001-07-01	8.8305
2001-10-01	8.5479
2002-01-01	8.1705
2002-04-01	8.0360
2002-07-01	7.9877
2002-10-01	8.1889
2003-01-01	8.2925
2003-04-01	8.4216
2003-07-01	8.8459
2003-10-01	8.7015
2004-01-01	7.8103
2004-04-01	7.4268
2004-07-01	7.0253
2004-10-01	6.9657
2005-01-01	6.8760
2005-04-01	6.6877
2005-07-01	6.4721
2005-10-01	6.7250
2006-01-01	7.1562
2006-04-01	6.8582
2006-07-01	7.4266
2006-10-01	9.0020
2007-01-01	10.5549
2007-04-01	11.4873
2007-07-01	13.6450
2007-10-01	14.4115
2008-01-01	16.2494
2008-04-01	17.3162
2008-07-01	17.1868
2008-10-01	15.9366
2009-01-01	15.1331
2009-04-01	14.7308
2009-07-01	13.6669
2009-10-01	17.8525
2010-01-01	19.7270
2010-04-01	22.0009
2010-07-01	24.5243
2010-10-01	25.0495
2011-01-01	27.9669
2011-04-01	29.3590
2011-07-01	28.7732
2011-10-01	28.0965
2012-01-01	30.2835
2012-04-01	30.3604
2012-07-01	31.0173
2012-10-01	32.9971
2013-01-01	32.5084
2013-04-01	34.3186
2013-07-01	34.2840
2013-10-01	33.0935
2014-01-01	34.7537
2014-04-01	37.5244
2014-07-01	39.1957
2014-10-01	38.0558
2015-01-01	37.3579
2015-04-01	37.7999