Quarter	Billions of US Dollars
1993-07-01	26.354
1993-10-01	26.463
1994-01-01	29.287
1994-04-01	31.813
1994-07-01	34.302
1994-10-01	34.494
1995-01-01	35.883
1995-04-01	36.668
1995-07-01	36.011
1995-10-01	35.911
1996-01-01	35.478
1996-04-01	35.564
1996-07-01	34.401
1996-10-01	34.484
1997-01-01	33.790
1997-04-01	35.422
1997-07-01	37.572
1997-10-01	37.233
1998-01-01	36.886
1998-04-01	37.136
1998-07-01	38.717
1998-10-01	38.209
1999-01-01	35.323
1999-04-01	35.248
1999-07-01	38.003
1999-10-01	40.267
2000-01-01	40.075
2000-04-01	55.733
2000-07-01	60.758
2000-10-01	69.818
2001-01-01	72.261
2001-04-01	72.627
2001-07-01	80.962
2001-10-01	75.561
2002-01-01	75.334
2002-04-01	80.433
2002-07-01	76.534
2002-10-01	74.659
2003-01-01	75.500
2003-04-01	74.786
2003-07-01	69.142
2003-10-01	70.812
2004-01-01	73.495
2004-04-01	77.819
2004-07-01	84.091
2004-10-01	95.228
2005-01-01	91.950
2005-04-01	91.359
2005-07-01	88.142
2005-10-01	96.808
2006-01-01	102.545
2006-04-01	120.957
2006-07-01	133.216
2006-10-01	154.552
2007-01-01	158.537
2007-04-01	178.197
2007-07-01	182.655
2007-10-01	182.111
2008-01-01	193.015
2008-04-01	192.637
2008-07-01	174.983
2008-10-01	170.807
2009-01-01	163.697
2009-04-01	166.527
2009-07-01	167.688
2009-10-01	161.054
2010-01-01	151.329
2010-04-01	137.214
2010-07-01	147.394
2010-10-01	142.813
2011-01-01	150.125
2011-04-01	147.894
2011-07-01	141.447
2011-10-01	133.758
2012-01-01	134.887
2012-04-01	123.427
2012-07-01	126.021
2012-10-01	125.680
2013-01-01	125.624
2013-04-01	127.624
2013-07-01	136.311
2013-10-01	144.325
2014-01-01	144.676
2014-04-01	141.372
2014-07-01	138.101
2014-10-01	143.853
2015-01-01	134.240
2015-04-01	147.369