Quarter	Billions of US Dollars
1993-07-01	0.813
1993-10-01	0.813
1994-01-01	0.813
1994-04-01	1.440
1994-07-01	2.577
1994-10-01	4.465
1995-01-01	4.810
1995-04-01	5.057
1995-07-01	5.676
1995-10-01	6.514
1996-01-01	8.693
1996-04-01	9.003
1996-07-01	10.341
1996-10-01	10.714
1997-01-01	10.171
1997-04-01	10.456
1997-07-01	10.940
1997-10-01	13.578
1998-01-01	17.116
1998-04-01	16.801
1998-07-01	17.481
1998-10-01	18.794
1999-01-01	19.256
1999-04-01	18.558
1999-07-01	19.559
1999-10-01	18.541
2000-01-01	20.121
2000-04-01	20.333
2000-07-01	19.039
2000-10-01	18.850
2001-01-01	17.598
2001-04-01	17.145
2001-07-01	18.602
2001-10-01	18.581
2002-01-01	22.954
2002-04-01	25.833
2002-07-01	25.126
2002-10-01	25.192
2003-01-01	36.070
2003-04-01	38.381
2003-07-01	39.249
2003-10-01	41.356
2004-01-01	39.358
2004-04-01	41.293
2004-07-01	40.796
2004-10-01	41.799
2005-01-01	39.366
2005-04-01	39.357
2005-07-01	38.511
2005-10-01	37.708
2006-01-01	43.864
2006-04-01	50.516
2006-07-01	48.431
2006-10-01	49.494
2007-01-01	58.670
2007-04-01	67.629
2007-07-01	66.774
2007-10-01	63.906
2008-01-01	61.896
2008-04-01	67.256
2008-07-01	57.775
2008-10-01	57.566
2009-01-01	72.378
2009-04-01	102.083
2009-07-01	109.461
2009-10-01	96.527
2010-01-01	88.332
2010-04-01	83.224
2010-07-01	91.657
2010-10-01	89.931
2011-01-01	94.726
2011-04-01	96.400
2011-07-01	90.428
2011-10-01	86.805
2012-01-01	70.008
2012-04-01	54.462
2012-07-01	55.084
2012-10-01	55.974
2013-01-01	54.324
2013-04-01	47.315
2013-07-01	48.073
2013-10-01	48.961
2014-01-01	48.977
2014-04-01	55.747
2014-07-01	55.139
2014-10-01	53.141
2015-01-01	47.205
2015-04-01	49.035