Quarter	Billions of US Dollars
1993-07-01	3.162
1993-10-01	3.707
1994-01-01	3.261
1994-04-01	3.753
1994-07-01	3.635
1994-10-01	2.979
1995-01-01	2.160
1995-04-01	1.720
1995-07-01	1.786
1995-10-01	2.566
1996-01-01	1.845
1996-04-01	2.191
1996-07-01	1.469
1996-10-01	2.428
1997-01-01	2.026
1997-04-01	1.612
1997-07-01	1.755
1997-10-01	1.260
1998-01-01	1.007
1998-04-01	1.134
1998-07-01	0.898
1998-10-01	0.803
1999-01-01	0.947
1999-04-01	1.660
1999-07-01	1.650
1999-10-01	1.856
2000-01-01	1.225
2000-04-01	2.520
2000-07-01	2.851
2000-10-01	4.121
2001-01-01	7.065
2001-04-01	6.267
2001-07-01	7.882
2001-10-01	10.299
2002-01-01	8.455
2002-04-01	16.042
2002-07-01	18.949
2002-10-01	22.524
2003-01-01	27.618
2003-04-01	29.106
2003-07-01	31.989
2003-10-01	35.974
2004-01-01	35.867
2004-04-01	35.679
2004-07-01	35.651
2004-10-01	34.329
2005-01-01	28.441
2005-04-01	29.509
2005-07-01	26.815
2005-10-01	31.075
2006-01-01	32.602
2006-04-01	26.050
2006-07-01	34.865
2006-10-01	36.232
2007-01-01	39.298
2007-04-01	48.904
2007-07-01	49.083
2007-10-01	55.870
2008-01-01	66.592
2008-04-01	70.513
2008-07-01	70.944
2008-10-01	70.742
2009-01-01	81.184
2009-04-01	86.607
2009-07-01	84.007
2009-10-01	89.098
2010-01-01	86.898
2010-04-01	86.403
2010-07-01	97.604
2010-10-01	89.982
2011-01-01	129.288
2011-04-01	136.910
2011-07-01	138.464
2011-10-01	153.802
2012-01-01	131.880
2012-04-01	109.173
2012-07-01	100.599
2012-10-01	91.071
2013-01-01	91.420
2013-04-01	100.799
2013-07-01	118.733
2013-10-01	104.059
2014-01-01	79.731
2014-04-01	65.636
2014-07-01	60.797
2014-10-01	61.753
2015-01-01	64.787
2015-04-01	67.088