Quarter	Billions of US Dollars
1993-07-01	2.202
1993-10-01	2.375
1994-01-01	2.612
1994-04-01	3.419
1994-07-01	4.166
1994-10-01	5.724
1995-01-01	7.579
1995-04-01	8.767
1995-07-01	7.133
1995-10-01	8.016
1996-01-01	8.927
1996-04-01	9.165
1996-07-01	10.161
1996-10-01	9.269
1997-01-01	10.091
1997-04-01	7.682
1997-07-01	8.220
1997-10-01	9.971
1998-01-01	7.315
1998-04-01	8.638
1998-07-01	10.711
1998-10-01	17.147
1999-01-01	32.188
1999-04-01	28.519
1999-07-01	38.869
1999-10-01	29.023
2000-01-01	44.084
2000-04-01	44.052
2000-07-01	46.121
2000-10-01	47.420
2001-01-01	65.398
2001-04-01	56.820
2001-07-01	53.214
2001-10-01	59.913
2002-01-01	68.580
2002-04-01	63.052
2002-07-01	82.712
2002-10-01	89.817
2003-01-01	121.664
2003-04-01	128.794
2003-07-01	115.791
2003-10-01	149.460
2004-01-01	155.174
2004-04-01	148.913
2004-07-01	169.754
2004-10-01	175.276
2005-01-01	202.227
2005-04-01	196.947
2005-07-01	188.780
2005-10-01	167.160
2006-01-01	195.157
2006-04-01	228.006
2006-07-01	233.104
2006-10-01	224.079
2007-01-01	282.825
2007-04-01	297.312
2007-07-01	256.751
2007-10-01	223.545
2008-01-01	293.289
2008-04-01	310.827
2008-07-01	307.681
2008-10-01	237.874
2009-01-01	243.184
2009-04-01	242.504
2009-07-01	260.565
2009-10-01	201.262
2010-01-01	229.053
2010-04-01	189.842
2010-07-01	206.434
2010-10-01	169.022
2011-01-01	195.820
2011-04-01	186.430
2011-07-01	210.999
2011-10-01	203.100
2012-01-01	213.095
2012-04-01	177.062
2012-07-01	147.899
2012-10-01	99.180
2013-01-01	121.852
2013-04-01	111.717
2013-07-01	129.215
2013-10-01	119.726
2014-01-01	142.669
2014-04-01	139.927
2014-07-01	129.610
2014-10-01	106.506
2015-01-01	117.012
2015-04-01	91.682