Quarter	Billions of US Dollars
1993-07-01	2.313
1993-10-01	2.376
1994-01-01	2.540
1994-04-01	3.718
1994-07-01	4.873
1994-10-01	5.491
1995-01-01	6.228
1995-04-01	6.280
1995-07-01	8.250
1995-10-01	13.174
1996-01-01	16.581
1996-04-01	16.737
1996-07-01	14.811
1996-10-01	15.325
1997-01-01	13.622
1997-04-01	14.175
1997-07-01	15.170
1997-10-01	18.777
1998-01-01	21.169
1998-04-01	22.611
1998-07-01	22.751
1998-10-01	27.359
1999-01-01	34.232
1999-04-01	36.532
1999-07-01	53.171
1999-10-01	66.381
2000-01-01	77.285
2000-04-01	86.292
2000-07-01	84.927
2000-10-01	89.708
2001-01-01	89.878
2001-04-01	83.179
2001-07-01	89.627
2001-10-01	88.937
2002-01-01	98.949
2002-04-01	124.050
2002-07-01	135.172
2002-10-01	129.935
2003-01-01	143.094
2003-04-01	133.939
2003-07-01	122.096
2003-10-01	144.909
2004-01-01	145.416
2004-04-01	149.060
2004-07-01	159.743
2004-10-01	171.981
2005-01-01	164.975
2005-04-01	153.314
2005-07-01	153.271
2005-10-01	147.540
2006-01-01	156.542
2006-04-01	161.093
2006-07-01	173.576
2006-10-01	179.669
2007-01-01	214.456
2007-04-01	241.552
2007-07-01	269.686
2007-10-01	289.814
2008-01-01	335.070
2008-04-01	320.973
2008-07-01	296.575
2008-10-01	303.444
2009-01-01	262.058
2009-04-01	275.161
2009-07-01	276.223
2009-10-01	271.665
2010-01-01	267.028
2010-04-01	248.707
2010-07-01	241.579
2010-10-01	233.442
2011-01-01	239.305
2011-04-01	240.614
2011-07-01	272.885
2011-10-01	293.325
2012-01-01	314.016
2012-04-01	313.180
2012-07-01	293.493
2012-10-01	293.543
2013-01-01	287.719
2013-04-01	292.888
2013-07-01	290.075
2013-10-01	293.166
2014-01-01	284.919
2014-04-01	282.264
2014-07-01	296.991
2014-10-01	327.892
2015-01-01	314.571
2015-04-01	309.478