Quarter	Billions of US Dollars
1993-07-01	238.517
1993-10-01	228.717
1994-01-01	237.929
1994-04-01	238.656
1994-07-01	234.667
1994-10-01	222.711
1995-01-01	234.196
1995-04-01	232.979
1995-07-01	207.155
1995-10-01	199.490
1996-01-01	191.207
1996-04-01	183.979
1996-07-01	177.978
1996-10-01	165.577
1997-01-01	151.135
1997-04-01	149.850
1997-07-01	138.751
1997-10-01	125.058
1998-01-01	111.774
1998-04-01	99.034
1998-07-01	96.128
1998-10-01	101.612
1999-01-01	94.295
1999-04-01	92.823
1999-07-01	97.648
1999-10-01	90.066
2000-01-01	78.002
2000-04-01	74.316
2000-07-01	68.872
2000-10-01	64.378
2001-01-01	58.155
2001-04-01	55.342
2001-07-01	54.811
2001-10-01	52.169
2002-01-01	51.855
2002-04-01	58.948
2002-07-01	55.301
2002-10-01	53.343
2003-01-01	50.939
2003-04-01	51.880
2003-07-01	49.693
2003-10-01	56.838
2004-01-01	59.876
2004-04-01	64.098
2004-07-01	63.096
2004-10-01	69.340
2005-01-01	66.975
2005-04-01	65.810
2005-07-01	64.069
2005-10-01	62.699
2006-01-01	62.866
2006-04-01	64.290
2006-07-01	61.598
2006-10-01	62.413
2007-01-01	59.704
2007-04-01	57.504
2007-07-01	60.169
2007-10-01	61.394
2008-01-01	67.282
2008-04-01	66.335
2008-07-01	65.654
2008-10-01	68.516
2009-01-01	60.815
2009-04-01	54.919
2009-07-01	55.477
2009-10-01	53.388
2010-01-01	50.581
2010-04-01	49.204
2010-07-01	54.223
2010-10-01	53.193
2011-01-01	51.447
2011-04-01	46.045
2011-07-01	44.116
2011-10-01	44.325
2012-01-01	42.245
2012-04-01	42.406
2012-07-01	47.976
2012-10-01	46.313
2013-01-01	42.204
2013-04-01	45.238
2013-07-01	51.251
2013-10-01	50.399
2014-01-01	49.266
2014-04-01	53.555
2014-07-01	54.799
2014-10-01	54.180
2015-01-01	50.489
2015-04-01	53.500