Quarter	Billions of US Dollars
1993-07-01	25.530
1993-10-01	36.602
1994-01-01	24.193
1994-04-01	67.251
1994-07-01	27.220
1994-10-01	30.767
1995-01-01	31.781
1995-04-01	24.357
1995-07-01	26.087
1995-10-01	31.897
1996-01-01	42.995
1996-04-01	64.603
1996-07-01	61.201
1996-10-01	55.978
1997-01-01	69.453
1997-04-01	81.331
1997-07-01	75.393
1997-10-01	35.751
1998-01-01	88.361
1998-04-01	85.115
1998-07-01	53.025
1998-10-01	72.618
1999-01-01	99.904
1999-04-01	96.526
1999-07-01	88.747
1999-10-01	56.953
2000-01-01	115.615
2000-04-01	96.620
2000-07-01	125.119
2000-10-01	100.310
2001-01-01	214.905
2001-04-01	223.009
2001-07-01	131.325
2001-10-01	149.070
2002-01-01	193.575
2002-04-01	151.063
2002-07-01	96.898
2002-10-01	121.248
2003-01-01	165.153
2003-04-01	155.323
2003-07-01	139.528
2003-10-01	148.085
2004-01-01	161.829
2004-04-01	136.442
2004-07-01	146.425
2004-10-01	138.187
2005-01-01	169.513
2005-04-01	146.411
2005-07-01	169.581
2005-10-01	160.964
2006-01-01	176.247
2006-04-01	192.485
2006-07-01	191.906
2006-10-01	222.294
2007-01-01	241.331
2007-04-01	269.330
2007-07-01	184.693
2007-10-01	166.188
2008-01-01	162.649
2008-04-01	260.390
2008-07-01	128.840
2008-10-01	90.661
2009-01-01	232.715
2009-04-01	257.744
2009-07-01	215.548
2009-10-01	235.913
2010-01-01	255.038
2010-04-01	193.823
2010-07-01	288.492
2010-10-01	211.668
2011-01-01	312.478
2011-04-01	247.220
2011-07-01	191.304
2011-10-01	198.529
2012-01-01	420.864
2012-04-01	259.183
2012-07-01	308.658
2012-10-01	306.526
2013-01-01	358.658
2013-04-01	319.697
2013-07-01	248.254
2013-10-01	254.034
2014-01-01	344.912
2014-04-01	381.213
2014-07-01	357.614
2014-10-01	275.707
2015-01-01	395.889
2015-04-01	355.722