Quarter	Billions of US Dollars
1993-07-01	6.430
1993-10-01	5.844
1994-01-01	6.504
1994-04-01	5.281
1994-07-01	5.636
1994-10-01	4.870
1995-01-01	6.418
1995-04-01	4.739
1995-07-01	5.922
1995-10-01	6.488
1996-01-01	6.425
1996-04-01	11.880
1996-07-01	10.627
1996-10-01	8.382
1997-01-01	10.316
1997-04-01	8.226
1997-07-01	11.452
1997-10-01	11.184
1998-01-01	11.925
1998-04-01	7.524
1998-07-01	13.433
1998-10-01	11.076
1999-01-01	12.301
1999-04-01	10.847
1999-07-01	12.707
1999-10-01	11.441
2000-01-01	14.655
2000-04-01	13.627
2000-07-01	14.928
2000-10-01	13.844
2001-01-01	15.339
2001-04-01	16.421
2001-07-01	15.044
2001-10-01	11.001
2002-01-01	11.952
2002-04-01	15.174
2002-07-01	14.444
2002-10-01	17.647
2003-01-01	16.559
2003-04-01	17.038
2003-07-01	17.584
2003-10-01	17.295
2004-01-01	23.738
2004-04-01	26.530
2004-07-01	32.540
2004-10-01	33.222
2005-01-01	41.203
2005-04-01	38.258
2005-07-01	39.848
2005-10-01	34.198
2006-01-01	40.547
2006-04-01	34.493
2006-07-01	31.621
2006-10-01	40.194
2007-01-01	38.872
2007-04-01	53.391
2007-07-01	41.540
2007-10-01	58.853
2008-01-01	71.902
2008-04-01	90.412
2008-07-01	74.197
2008-10-01	59.945
2009-01-01	64.671
2009-04-01	65.300
2009-07-01	65.070
2009-10-01	61.351
2010-01-01	76.821
2010-04-01	82.174
2010-07-01	81.497
2010-10-01	74.777
2011-01-01	107.915
2011-04-01	86.641
2011-07-01	64.716
2011-10-01	60.630
2012-01-01	77.611
2012-04-01	57.138
2012-07-01	65.460
2012-10-01	52.863
2013-01-01	64.379
2013-04-01	66.481
2013-07-01	59.328
2013-10-01	60.924
2014-01-01	68.538
2014-04-01	66.190
2014-07-01	59.620
2014-10-01	58.510
2015-01-01	50.949
2015-04-01	46.349