Quarter	Billions of US Dollars
1993-07-01	11.422
1993-10-01	16.061
1994-01-01	24.428
1994-04-01	10.357
1994-07-01	20.535
1994-10-01	10.667
1995-01-01	10.227
1995-04-01	12.696
1995-07-01	19.323
1995-10-01	11.042
1996-01-01	26.310
1996-04-01	27.185
1996-07-01	35.532
1996-10-01	44.165
1997-01-01	33.642
1997-04-01	34.808
1997-07-01	36.247
1997-10-01	37.210
1998-01-01	30.844
1998-04-01	50.712
1998-07-01	29.900
1998-10-01	12.074
1999-01-01	50.408
1999-04-01	78.224
1999-07-01	52.589
1999-10-01	52.813
2000-01-01	53.296
2000-04-01	79.591
2000-07-01	49.027
2000-10-01	69.230
2001-01-01	81.449
2001-04-01	78.235
2001-07-01	67.896
2001-10-01	81.637
2002-01-01	42.516
2002-04-01	50.520
2002-07-01	22.652
2002-10-01	36.750
2003-01-01	66.236
2003-04-01	61.926
2003-07-01	69.773
2003-10-01	115.981
2004-01-01	114.825
2004-04-01	129.341
2004-07-01	111.818
2004-10-01	153.658
2005-01-01	90.913
2005-04-01	196.813
2005-07-01	31.378
2005-10-01	261.814
2006-01-01	189.251
2006-04-01	242.410
2006-07-01	245.519
2006-10-01	425.952
2007-01-01	359.846
2007-04-01	417.101
2007-07-01	93.163
2007-10-01	82.445
2008-01-01	79.496
2008-04-01	280.782
2008-07-01	190.449
2008-10-01	412.138
2009-01-01	54.258
2009-04-01	71.234
2009-07-01	41.369
2009-10-01	-32.548
2010-01-01	-5.056
2010-04-01	-86.064
2010-07-01	37.204
2010-10-01	-65.559
2011-01-01	-46.157
2011-04-01	9.232
2011-07-01	-77.287
2011-10-01	11.834
2012-01-01	-85.873
2012-04-01	-156.157
2012-07-01	-134.724
2012-10-01	-50.381
2013-01-01	-49.375
2013-04-01	-64.365
2013-07-01	0.834
2013-10-01	10.452
2014-01-01	-77.196
2014-04-01	17.314
2014-07-01	6.546
2014-10-01	-16.263
2015-01-01	-34.957
2015-04-01	-8.573