Quarter	Billions of US Dollars
1993-07-01	0.391
1993-10-01	0.396
1994-01-01	0.275
1994-04-01	0.539
1994-07-01	0.671
1994-10-01	1.044
1995-01-01	1.487
1995-04-01	1.182
1995-07-01	0.923
1995-10-01	0.710
1996-01-01	0.945
1996-04-01	2.316
1996-07-01	1.542
1996-10-01	2.996
1997-01-01	4.094
1997-04-01	6.025
1997-07-01	8.008
1997-10-01	8.714
1998-01-01	10.912
1998-04-01	12.060
1998-07-01	15.926
1998-10-01	15.484
1999-01-01	17.913
1999-04-01	19.364
1999-07-01	19.666
1999-10-01	23.284
2000-01-01	22.577
2000-04-01	25.521
2000-07-01	25.569
2000-10-01	28.443
2001-01-01	29.126
2001-04-01	32.670
2001-07-01	30.939
2001-10-01	31.249
2002-01-01	32.698
2002-04-01	36.458
2002-07-01	35.346
2002-10-01	35.859
2003-01-01	41.008
2003-04-01	45.827
2003-07-01	46.171
2003-10-01	53.389
2004-01-01	61.887
2004-04-01	62.146
2004-07-01	71.982
2004-10-01	97.378
2005-01-01	103.073
2005-04-01	101.040
2005-07-01	107.526
2005-10-01	118.652
2006-01-01	133.552
2006-04-01	144.216
2006-07-01	155.131
2006-10-01	170.264
2007-01-01	187.565
2007-04-01	197.370
2007-07-01	205.936
2007-10-01	227.050
2008-01-01	233.238
2008-04-01	237.105
2008-07-01	216.207
2008-10-01	182.359
2009-01-01	182.184
2009-04-01	190.529
2009-07-01	246.580
2009-10-01	229.165
2010-01-01	214.213
2010-04-01	192.220
2010-07-01	168.846
2010-10-01	156.785
2011-01-01	126.383
2011-04-01	137.131
2011-07-01	129.129
2011-10-01	143.594
2012-01-01	185.368
2012-04-01	176.748
2012-07-01	169.030
2012-10-01	168.834
2013-01-01	149.053
2013-04-01	134.191
2013-07-01	143.468
2013-10-01	182.511
2014-01-01	180.350
2014-04-01	182.612
2014-07-01	168.386
2014-10-01	121.706
2015-01-01	84.462
2015-04-01	82.364