Quarter	Billions of US Dollars
1993-07-01	16.353
1993-10-01	19.015
1994-01-01	20.472
1994-04-01	12.957
1994-07-01	14.394
1994-10-01	18.547
1995-01-01	14.697
1995-04-01	19.610
1995-07-01	27.270
1995-10-01	21.169
1996-01-01	37.208
1996-04-01	39.006
1996-07-01	40.259
1996-10-01	51.904
1997-01-01	50.942
1997-04-01	45.791
1997-07-01	59.126
1997-10-01	47.404
1998-01-01	51.094
1998-04-01	66.525
1998-07-01	54.651
1998-10-01	35.820
1999-01-01	88.206
1999-04-01	95.215
1999-07-01	79.124
1999-10-01	68.928
2000-01-01	84.635
2000-04-01	87.953
2000-07-01	91.882
2000-10-01	95.093
2001-01-01	117.220
2001-04-01	125.357
2001-07-01	97.122
2001-10-01	127.678
2002-01-01	107.512
2002-04-01	119.092
2002-07-01	108.235
2002-10-01	124.246
2003-01-01	173.684
2003-04-01	179.142
2003-07-01	172.890
2003-10-01	198.843
2004-01-01	263.005
2004-04-01	228.909
2004-07-01	220.292
2004-10-01	251.471
2005-01-01	271.822
2005-04-01	320.683
2005-07-01	223.967
2005-10-01	366.715
2006-01-01	329.624
2006-04-01	391.395
2006-07-01	377.760
2006-10-01	543.626
2007-01-01	557.444
2007-04-01	550.249
2007-07-01	257.539
2007-10-01	241.088
2008-01-01	271.702
2008-04-01	516.702
2008-07-01	418.193
2008-10-01	625.967
2009-01-01	323.988
2009-04-01	287.603
2009-07-01	216.626
2009-10-01	216.589
2010-01-01	245.281
2010-04-01	191.875
2010-07-01	212.142
2010-10-01	190.849
2011-01-01	233.502
2011-04-01	251.171
2011-07-01	164.158
2011-10-01	238.129
2012-01-01	231.703
2012-04-01	169.202
2012-07-01	169.233
2012-10-01	148.066
2013-01-01	164.019
2013-04-01	184.646
2013-07-01	175.098
2013-10-01	200.795
2014-01-01	190.272
2014-04-01	234.095
2014-07-01	170.403
2014-10-01	145.269
2015-01-01	193.699
2015-04-01	154.356