Quarter	Billions of US Dollars
1987-01-01	2.1704
1987-04-01	2.0666
1987-07-01	1.9291
1987-10-01	1.7570
1988-01-01	1.5808
1988-04-01	1.5580
1988-07-01	1.5989
1988-10-01	1.6317
1989-01-01	1.5624
1989-04-01	1.4201
1989-07-01	1.4125
1989-10-01	1.4339
1990-01-01	1.3905
1990-04-01	1.4043
1990-07-01	1.3635
1990-10-01	1.2133
1991-01-01	1.1548
1991-04-01	1.1446
1991-07-01	1.1781
1991-10-01	1.2218
1992-01-01	1.3029
1992-04-01	1.4818
1992-07-01	1.3925
1992-10-01	1.5957
1993-01-01	1.8170
1993-04-01	0.6819
1993-07-01	0.6063
1993-10-01	0.5750
1994-01-01	0.6054
1994-04-01	0.5342
1994-07-01	0.5500
1994-10-01	0.5558
1995-01-01	0.6081
1995-04-01	0.4664
1995-07-01	0.3355
1995-10-01	0.2415
1996-01-01	0.2455
1996-04-01	0.2314
1996-07-01	0.2390
1996-10-01	0.2317
1997-01-01	0.2133
1997-04-01	0.2644
1997-07-01	0.3183
1997-10-01	0.5117
1998-01-01	0.5976
1998-04-01	0.5607
1998-07-01	0.5440
1998-10-01	0.7593
1999-01-01	0.8983
1999-04-01	0.9045
1999-07-01	0.9778
1999-10-01	0.9702
2000-01-01	0.9591
2000-04-01	1.0004
2000-07-01	0.9864
2000-10-01	0.9805
2001-01-01	0.9703
2001-04-01	1.0685
2001-07-01	1.0525
2001-10-01	1.1353
2002-01-01	1.5934
2002-04-01	1.6075
2002-07-01	1.8349
2002-10-01	2.0148
2003-01-01	2.0807
2003-04-01	2.1259
2003-07-01	2.0833
2003-10-01	2.2720
2004-01-01	3.2100
2004-04-01	3.5238
2004-07-01	3.7949
2004-10-01	3.9728
2005-01-01	4.7781
2005-04-01	5.8277
2005-07-01	7.3542
2005-10-01	10.9939
2006-01-01	12.3870
2006-04-01	15.8358
2006-07-01	17.3604
2006-10-01	23.2407
2007-01-01	28.9453
2007-04-01	30.5302
2007-07-01	31.0076
2007-10-01	30.6636
2008-01-01	33.8974
2008-04-01	34.7294
2008-07-01	34.1805
2008-10-01	29.6813
2009-01-01	27.3479
2009-04-01	27.5181
2009-07-01	28.9644
2009-10-01	30.4689
2010-01-01	30.2004
2010-04-01	28.6893
2010-07-01	29.0069
2010-10-01	27.0640
2011-01-01	29.0076
2011-04-01	27.6906
2011-07-01	28.2706
2011-10-01	28.1567
2012-01-01	31.3421
2012-04-01	32.1325
2012-07-01	34.7311
2012-10-01	44.1034
2013-01-01	47.9257
2013-04-01	54.7061
2013-07-01	55.9589
2013-10-01	59.7811
2014-01-01	60.5019
2014-04-01	67.1865
2014-07-01	68.1963
2014-10-01	68.1937
2015-01-01	71.1370
2015-04-01	78.2349