Quarter	Billions of US Dollars
1998-10-01	3.631
1999-01-01	4.684
1999-04-01	4.893
1999-07-01	5.243
1999-10-01	4.460
2000-01-01	4.248
2000-04-01	4.022
2000-07-01	4.379
2000-10-01	4.116
2001-01-01	4.927
2001-04-01	5.309
2001-07-01	5.387
2001-10-01	5.403
2002-01-01	5.466
2002-04-01	6.063
2002-07-01	6.543
2002-10-01	7.270
2003-01-01	8.471
2003-04-01	8.292
2003-07-01	9.840
2003-10-01	7.849
2004-01-01	8.743
2004-04-01	13.931
2004-07-01	15.091
2004-10-01	16.934
2005-01-01	20.769
2005-04-01	26.849
2005-07-01	31.840
2005-10-01	26.190
2006-01-01	24.711
2006-04-01	26.524
2006-07-01	30.823
2006-10-01	31.844
2007-01-01	37.172
2007-04-01	46.684
2007-07-01	46.204
2007-10-01	42.505
2008-01-01	47.797
2008-04-01	41.952
2008-07-01	39.303
2008-10-01	41.874
2009-01-01	51.975
2009-04-01	46.331
2009-07-01	45.163
2009-10-01	50.937
2010-01-01	55.554
2010-04-01	46.082
2010-07-01	43.440
2010-10-01	46.287
2011-01-01	56.611
2011-04-01	59.948
2011-07-01	59.073
2011-10-01	53.938
2012-01-01	75.680
2012-04-01	70.822
2012-07-01	76.864
2012-10-01	73.649
2013-01-01	77.618
2013-04-01	67.872
2013-07-01	64.193
2013-10-01	70.119
2014-01-01	74.787
2014-04-01	77.235
2014-07-01	75.655
2014-10-01	73.413
2015-01-01	71.396