Quarter	Billions of US Dollars
1993-07-01	1.6061
1993-10-01	2.2321
1994-01-01	2.2719
1994-04-01	2.6174
1994-07-01	3.4304
1994-10-01	2.4717
1995-01-01	2.6197
1995-04-01	3.0080
1995-07-01	2.2801
1995-10-01	1.6637
1996-01-01	1.9047
1996-04-01	1.5117
1996-07-01	1.5093
1996-10-01	1.9518
1997-01-01	1.5185
1997-04-01	1.3159
1997-07-01	2.2315
1997-10-01	3.0104
1998-01-01	3.6755
1998-04-01	4.2080
1998-07-01	3.4243
1998-10-01	3.7596
1999-01-01	3.0138
1999-04-01	3.7852
1999-07-01	4.5372
1999-10-01	3.9289
2000-01-01	3.2347
2000-04-01	9.7852
2000-07-01	12.9189
2000-10-01	17.9730
2001-01-01	17.3044
2001-04-01	13.0327
2001-07-01	14.1599
2001-10-01	15.5086
2002-01-01	13.2837
2002-04-01	12.2300
2002-07-01	12.7544
2002-10-01	13.4658
2003-01-01	13.0278
2003-04-01	16.3253
2003-07-01	13.6752
2003-10-01	15.0381
2004-01-01	13.6179
2004-04-01	11.7399
2004-07-01	8.6646
2004-10-01	11.2803
2005-01-01	8.5935
2005-04-01	12.4536
2005-07-01	13.2708
2005-10-01	13.1281
2006-01-01	12.1004
2006-04-01	9.6932
2006-07-01	8.6189
2006-10-01	12.6392
2007-01-01	11.9671
2007-04-01	16.2628
2007-07-01	9.7700
2007-10-01	11.2376
2008-01-01	11.6010
2008-04-01	9.3586
2008-07-01	10.0390
2008-10-01	8.7818
2009-01-01	8.4706
2009-04-01	5.8870
2009-07-01	4.2366
2009-10-01	5.4060
2010-01-01	4.4608
2010-04-01	4.4682
2010-07-01	5.4498
2010-10-01	7.5202
2011-01-01	5.6896
2011-04-01	4.6552
2011-07-01	3.2873
2011-10-01	6.5798
2012-01-01	8.8834
2012-04-01	11.5818
2012-07-01	14.8011
2012-10-01	15.3052
2013-01-01	18.2940
2013-04-01	21.6917
2013-07-01	19.5536
2013-10-01	15.9237
2014-01-01	14.5298
2014-04-01	16.2516
2014-07-01	14.1421
2014-10-01	14.4359
2015-01-01	13.3487
2015-04-01	11.9918