Quarter	Billions of US Dollars
1998-04-01	42.721
1998-07-01	41.821
1998-10-01	45.161
1999-01-01	44.881
1999-04-01	45.253
1999-07-01	44.610
1999-10-01	46.494
2000-01-01	45.470
2000-04-01	43.910
2000-07-01	38.495
2000-10-01	42.771
2001-01-01	40.192
2001-04-01	41.792
2001-07-01	39.918
2001-10-01	41.463
2002-01-01	45.866
2002-04-01	50.826
2002-07-01	50.090
2002-10-01	55.860
2003-01-01	59.526
2003-04-01	63.320
2003-07-01	64.113
2003-10-01	70.840
2004-01-01	74.010
2004-04-01	74.375
2004-07-01	78.951
2004-10-01	89.547
2005-01-01	90.675
2005-04-01	90.695
2005-07-01	92.616
2005-10-01	95.449
2006-01-01	87.351
2006-04-01	90.122
2006-07-01	98.955
2006-10-01	108.056
2007-01-01	115.230
2007-04-01	127.949
2007-07-01	128.643
2007-10-01	134.332
2008-01-01	140.995
2008-04-01	142.974
2008-07-01	129.257
2008-10-01	110.417
2009-01-01	110.502
2009-04-01	124.467
2009-07-01	136.212
2009-10-01	135.727
2010-01-01	132.782
2010-04-01	128.921
2010-07-01	136.517
2010-10-01	144.316
2011-01-01	142.247
2011-04-01	153.575
2011-07-01	141.049
2011-10-01	141.238
2012-01-01	152.784
2012-04-01	148.206
2012-07-01	154.865
2012-10-01	155.643
2013-01-01	159.635
2013-04-01	148.041
2013-07-01	158.549
2013-10-01	158.270
2014-01-01	167.345
2014-04-01	172.607
2014-07-01	154.491
2014-10-01	157.016
2015-01-01	150.371
2015-04-01	137.052
2015-07-01	130.785
2015-10-01	141.322
2016-01-01	144.797
2016-04-01	149.425
2016-07-01	155.206
2016-10-01	151.112
2017-01-01	153.256
2017-04-01	162.893
2017-07-01	164.447
2017-10-01	163.475
2018-01-01	166.490