Quarter	Billions of US Dollars
1993-07-01	11.531
1993-10-01	13.976
1994-01-01	14.255
1994-04-01	16.353
1994-07-01	20.712
1994-10-01	20.433
1995-01-01	27.049
1995-04-01	26.223
1995-07-01	30.327
1995-10-01	31.445
1996-01-01	31.735
1996-04-01	35.147
1996-07-01	35.740
1996-10-01	38.804
1997-01-01	37.700
1997-04-01	38.809
1997-07-01	39.902
1997-10-01	40.358
1998-01-01	44.988
1998-04-01	42.957
1998-07-01	48.257
1998-10-01	41.732
1999-01-01	50.250
1999-04-01	47.129
1999-07-01	56.236
1999-10-01	45.139
2000-01-01	60.008
2000-04-01	73.001
2000-07-01	68.146
2000-10-01	69.381
2001-01-01	69.081
2001-04-01	57.413
2001-07-01	52.983
2001-10-01	54.914
2002-01-01	56.259
2002-04-01	56.151
2002-07-01	79.845
2002-10-01	70.265
2003-01-01	92.312
2003-04-01	102.430
2003-07-01	102.617
2003-10-01	118.764
2004-01-01	130.458
2004-04-01	130.687
2004-07-01	145.879
2004-10-01	149.643
2005-01-01	150.587
2005-04-01	158.952
2005-07-01	169.983
2005-10-01	159.093
2006-01-01	173.152
2006-04-01	175.940
2006-07-01	198.263
2006-10-01	217.584
2007-01-01	246.499
2007-04-01	245.665
2007-07-01	265.188
2007-10-01	262.661
2008-01-01	307.976
2008-04-01	288.335
2008-07-01	240.439
2008-10-01	229.999
2009-01-01	192.222
2009-04-01	193.165
2009-07-01	215.397
2009-10-01	156.101
2010-01-01	189.407
2010-04-01	144.242
2010-07-01	175.732
2010-10-01	129.993
2011-01-01	146.098
2011-04-01	136.173
2011-07-01	130.647
2011-10-01	114.310
2012-01-01	159.511
2012-04-01	143.210
2012-07-01	132.605
2012-10-01	123.552
2013-01-01	122.311
2013-04-01	121.835
2013-07-01	122.645
2013-10-01	129.716
2014-01-01	132.109
2014-04-01	135.252
2014-07-01	139.162
2014-10-01	128.806
2015-01-01	129.352
2015-04-01	111.678