Quarter	Billions of US Dollars
1993-07-01	1.539
1993-10-01	1.469
1994-01-01	1.599
1994-04-01	1.709
1994-07-01	1.975
1994-10-01	2.740
1995-01-01	4.158
1995-04-01	5.862
1995-07-01	6.411
1995-10-01	6.097
1996-01-01	5.219
1996-04-01	5.052
1996-07-01	5.717
1996-10-01	9.157
1997-01-01	8.934
1997-04-01	9.928
1997-07-01	9.547
1997-10-01	8.815
1998-01-01	9.633
1998-04-01	11.375
1998-07-01	12.401
1998-10-01	14.227
1999-01-01	13.715
1999-04-01	13.544
1999-07-01	14.004
1999-10-01	12.588
2000-01-01	13.389
2000-04-01	13.077
2000-07-01	14.436
2000-10-01	14.972
2001-01-01	14.698
2001-04-01	15.538
2001-07-01	13.538
2001-10-01	14.399
2002-01-01	12.390
2002-04-01	11.559
2002-07-01	9.669
2002-10-01	9.019
2003-01-01	8.143
2003-04-01	9.304
2003-07-01	11.176
2003-10-01	11.843
2004-01-01	11.959
2004-04-01	10.303
2004-07-01	11.943
2004-10-01	14.731
2005-01-01	15.334
2005-04-01	16.445
2005-07-01	13.260
2005-10-01	13.497
2006-01-01	15.281
2006-04-01	18.139
2006-07-01	21.473
2006-10-01	23.820
2007-01-01	24.252
2007-04-01	23.686
2007-07-01	25.640
2007-10-01	25.780
2008-01-01	30.130
2008-04-01	35.424
2008-07-01	36.230
2008-10-01	34.811
2009-01-01	36.094
2009-04-01	40.081
2009-07-01	42.657
2009-10-01	40.129
2010-01-01	36.036
2010-04-01	36.226
2010-07-01	36.728
2010-10-01	38.402
2011-01-01	47.981
2011-04-01	55.559
2011-07-01	55.987
2011-10-01	64.648
2012-01-01	69.686
2012-04-01	69.878
2012-07-01	75.518
2012-10-01	73.209
2013-01-01	85.179
2013-04-01	95.998
2013-07-01	111.973
2013-10-01	120.931
2014-01-01	142.182
2014-04-01	147.008
2014-07-01	155.388
2014-10-01	165.548
2015-01-01	163.870
2015-04-01	168.761