Quarter	Billions of US Dollars
1993-07-01	0.141
1993-10-01	0.088
1994-01-01	0.044
1994-04-01	0.091
1994-07-01	0.154
1994-10-01	0.188
1995-01-01	0.560
1995-04-01	0.264
1995-07-01	0.192
1995-10-01	0.240
1996-01-01	1.867
1996-04-01	1.480
1996-07-01	1.460
1996-10-01	1.282
1997-01-01	2.611
1997-04-01	3.851
1997-07-01	5.372
1997-10-01	4.914
1998-01-01	5.709
1998-04-01	6.348
1998-07-01	10.107
1998-10-01	8.018
1999-01-01	13.769
1999-04-01	12.890
1999-07-01	12.895
1999-10-01	11.226
2000-01-01	15.286
2000-04-01	16.568
2000-07-01	14.586
2000-10-01	15.369
2001-01-01	19.070
2001-04-01	23.095
2001-07-01	20.085
2001-10-01	24.463
2002-01-01	25.033
2002-04-01	25.532
2002-07-01	26.107
2002-10-01	25.826
2003-01-01	31.809
2003-04-01	34.534
2003-07-01	29.496
2003-10-01	33.195
2004-01-01	43.714
2004-04-01	41.014
2004-07-01	46.467
2004-10-01	59.935
2005-01-01	66.063
2005-04-01	61.576
2005-07-01	66.956
2005-10-01	73.583
2006-01-01	77.393
2006-04-01	74.497
2006-07-01	82.402
2006-10-01	92.046
2007-01-01	111.956
2007-04-01	107.297
2007-07-01	114.724
2007-10-01	113.250
2008-01-01	123.052
2008-04-01	125.645
2008-07-01	121.293
2008-10-01	81.544
2009-01-01	75.298
2009-04-01	58.299
2009-07-01	79.128
2009-10-01	58.769
2010-01-01	67.767
2010-04-01	61.557
2010-07-01	71.015
2010-10-01	56.690
2011-01-01	46.632
2011-04-01	38.052
2011-07-01	32.590
2011-10-01	34.066
2012-01-01	68.572
2012-04-01	40.828
2012-07-01	26.770
2012-10-01	30.006
2013-01-01	65.776
2013-04-01	21.140
2013-07-01	20.868
2013-10-01	18.368
2014-01-01	21.164
2014-04-01	19.564
2014-07-01	20.423
2014-10-01	21.562
2015-01-01	20.560
2015-04-01	20.851