Quarter	Billions of US Dollars
1993-07-01	3.395
1993-10-01	4.051
1994-01-01	4.073
1994-04-01	3.382
1994-07-01	3.289
1994-10-01	4.762
1995-01-01	4.533
1995-04-01	4.157
1995-07-01	5.680
1995-10-01	6.434
1996-01-01	7.768
1996-04-01	7.275
1996-07-01	6.779
1996-10-01	7.294
1997-01-01	9.433
1997-04-01	9.246
1997-07-01	9.467
1997-10-01	11.668
1998-01-01	11.934
1998-04-01	11.182
1998-07-01	11.763
1998-10-01	12.555
1999-01-01	13.414
1999-04-01	17.161
1999-07-01	18.343
1999-10-01	17.867
2000-01-01	22.412
2000-04-01	23.501
2000-07-01	24.064
2000-10-01	28.811
2001-01-01	29.825
2001-04-01	31.941
2001-07-01	27.550
2001-10-01	32.082
2002-01-01	33.233
2002-04-01	38.982
2002-07-01	41.986
2002-10-01	40.407
2003-01-01	53.128
2003-04-01	53.858
2003-07-01	50.064
2003-10-01	55.750
2004-01-01	64.317
2004-04-01	66.226
2004-07-01	67.399
2004-10-01	80.623
2005-01-01	85.437
2005-04-01	95.301
2005-07-01	97.283
2005-10-01	98.610
2006-01-01	111.211
2006-04-01	106.652
2006-07-01	108.417
2006-10-01	117.945
2007-01-01	134.332
2007-04-01	134.209
2007-07-01	114.424
2007-10-01	121.570
2008-01-01	138.625
2008-04-01	139.328
2008-07-01	103.088
2008-10-01	123.846
2009-01-01	88.611
2009-04-01	88.340
2009-07-01	90.486
2009-10-01	76.040
2010-01-01	83.423
2010-04-01	71.180
2010-07-01	84.954
2010-10-01	99.049
2011-01-01	103.808
2011-04-01	109.902
2011-07-01	104.076
2011-10-01	109.830
2012-01-01	140.126
2012-04-01	116.026
2012-07-01	102.086
2012-10-01	91.240
2013-01-01	116.263
2013-04-01	113.268
2013-07-01	106.405
2013-10-01	113.124
2014-01-01	110.898
2014-04-01	113.319
2014-07-01	104.884
2014-10-01	110.729
2015-01-01	99.453
2015-04-01	95.285