Quarter	Billions of US Dollars
1993-07-01	6.418
1993-10-01	6.821
1994-01-01	7.449
1994-04-01	8.142
1994-07-01	8.470
1994-10-01	9.144
1995-01-01	11.763
1995-04-01	12.619
1995-07-01	12.155
1995-10-01	12.330
1996-01-01	13.713
1996-04-01	14.869
1996-07-01	15.305
1996-10-01	15.204
1997-01-01	16.046
1997-04-01	13.518
1997-07-01	15.143
1997-10-01	17.189
1998-01-01	14.843
1998-04-01	13.726
1998-07-01	16.656
1998-10-01	24.619
1999-01-01	47.190
1999-04-01	46.228
1999-07-01	65.962
1999-10-01	57.360
2000-01-01	75.423
2000-04-01	73.458
2000-07-01	77.671
2000-10-01	81.612
2001-01-01	87.264
2001-04-01	73.383
2001-07-01	72.340
2001-10-01	79.508
2002-01-01	90.823
2002-04-01	89.761
2002-07-01	116.444
2002-10-01	118.968
2003-01-01	156.276
2003-04-01	162.333
2003-07-01	145.687
2003-10-01	177.163
2004-01-01	199.937
2004-04-01	190.005
2004-07-01	208.677
2004-10-01	223.788
2005-01-01	250.986
2005-04-01	240.853
2005-07-01	234.730
2005-10-01	212.239
2006-01-01	239.334
2006-04-01	273.392
2006-07-01	277.595
2006-10-01	269.133
2007-01-01	335.274
2007-04-01	353.288
2007-07-01	352.868
2007-10-01	343.858
2008-01-01	442.166
2008-04-01	461.378
2008-07-01	420.376
2008-10-01	316.442
2009-01-01	330.477
2009-04-01	321.175
2009-07-01	355.552
2009-10-01	267.211
2010-01-01	314.976
2010-04-01	269.514
2010-07-01	279.379
2010-10-01	242.229
2011-01-01	281.923
2011-04-01	242.424
2011-07-01	270.479
2011-10-01	269.588
2012-01-01	351.435
2012-04-01	255.736
2012-07-01	205.549
2012-10-01	154.486
2013-01-01	208.285
2013-04-01	166.002
2013-07-01	166.924
2013-10-01	170.829
2014-01-01	193.707
2014-04-01	193.380
2014-07-01	186.756
2014-10-01	163.888
2015-01-01	185.692
2015-04-01	160.684