Quarter	Billions of US Dollars
1993-07-01	4.290
1993-10-01	4.370
1994-01-01	5.009
1994-04-01	5.044
1994-07-01	5.109
1994-10-01	3.766
1995-01-01	4.206
1995-04-01	4.431
1995-07-01	4.712
1995-10-01	6.324
1996-01-01	8.006
1996-04-01	9.786
1996-07-01	8.418
1996-10-01	10.246
1997-01-01	10.307
1997-04-01	11.339
1997-07-01	14.197
1997-10-01	16.796
1998-01-01	19.207
1998-04-01	20.185
1998-07-01	25.294
1998-10-01	28.621
1999-01-01	29.591
1999-04-01	33.039
1999-07-01	38.047
1999-10-01	36.842
2000-01-01	37.608
2000-04-01	38.062
2000-07-01	36.584
2000-10-01	40.499
2001-01-01	44.805
2001-04-01	42.786
2001-07-01	42.920
2001-10-01	44.011
2002-01-01	40.508
2002-04-01	52.992
2002-07-01	56.973
2002-10-01	66.884
2003-01-01	79.583
2003-04-01	78.964
2003-07-01	84.586
2003-10-01	87.816
2004-01-01	87.183
2004-04-01	93.615
2004-07-01	91.582
2004-10-01	98.312
2005-01-01	98.971
2005-04-01	101.266
2005-07-01	99.348
2005-10-01	107.800
2006-01-01	120.606
2006-04-01	134.162
2006-07-01	141.311
2006-10-01	141.374
2007-01-01	156.712
2007-04-01	159.544
2007-07-01	163.027
2007-10-01	184.584
2008-01-01	217.666
2008-04-01	216.119
2008-07-01	207.717
2008-10-01	180.952
2009-01-01	178.815
2009-04-01	202.396
2009-07-01	207.150
2009-10-01	194.902
2010-01-01	192.224
2010-04-01	166.574
2010-07-01	196.394
2010-10-01	193.606
2011-01-01	234.966
2011-04-01	239.662
2011-07-01	247.195
2011-10-01	236.170
2012-01-01	235.458
2012-04-01	219.444
2012-07-01	211.779
2012-10-01	216.652
2013-01-01	220.638
2013-04-01	237.033
2013-07-01	226.257
2013-10-01	223.157
2014-01-01	226.660
2014-04-01	204.459
2014-07-01	208.083
2014-10-01	206.076
2015-01-01	191.732
2015-04-01	203.422