Quarter	Billions of US Dollars
1993-07-01	30.699
1993-10-01	32.238
1994-01-01	35.038
1994-04-01	36.521
1994-07-01	38.143
1994-10-01	42.130
1995-01-01	43.376
1995-04-01	43.274
1995-07-01	49.967
1995-10-01	54.620
1996-01-01	59.044
1996-04-01	60.839
1996-07-01	66.223
1996-10-01	70.240
1997-01-01	74.844
1997-04-01	78.535
1997-07-01	82.232
1997-10-01	78.149
1998-01-01	81.803
1998-04-01	82.458
1998-07-01	84.045
1998-10-01	86.095
1999-01-01	87.701
1999-04-01	93.157
1999-07-01	95.347
1999-10-01	95.589
2000-01-01	95.425
2000-04-01	94.761
2000-07-01	88.103
2000-10-01	91.370
2001-01-01	89.955
2001-04-01	93.517
2001-07-01	97.120
2001-10-01	99.341
2002-01-01	104.094
2002-04-01	116.097
2002-07-01	120.860
2002-10-01	134.485
2003-01-01	147.115
2003-04-01	162.639
2003-07-01	169.528
2003-10-01	186.241
2004-01-01	200.894
2004-04-01	199.969
2004-07-01	213.236
2004-10-01	238.007
2005-01-01	248.191
2005-04-01	256.151
2005-07-01	273.584
2005-10-01	281.543
2006-01-01	291.550
2006-04-01	302.906
2006-07-01	317.816
2006-10-01	348.195
2007-01-01	368.107
2007-04-01	406.247
2007-07-01	430.535
2007-10-01	442.383
2008-01-01	472.280
2008-04-01	504.604
2008-07-01	452.498
2008-10-01	399.944
2009-01-01	391.861
2009-04-01	444.260
2009-07-01	474.131
2009-10-01	485.962
2010-01-01	500.553
2010-04-01	479.802
2010-07-01	543.495
2010-10-01	574.777
2011-01-01	610.189
2011-04-01	647.497
2011-07-01	622.921
2011-10-01	645.886
2012-01-01	696.350
2012-04-01	696.035
2012-07-01	746.491
2012-10-01	763.642
2013-01-01	776.225
2013-04-01	742.122
2013-07-01	750.081
2013-10-01	743.294
2014-01-01	766.576
2014-04-01	779.560
2014-07-01	750.546
2014-10-01	719.544
2015-01-01	681.977
2015-04-01	692.932