Quarter	Billions of US Dollars
1990-01-01	25.163
1990-04-01	26.540
1990-07-01	28.332
1990-10-01	29.555
1991-01-01	30.661
1991-04-01	31.503
1991-07-01	33.928
1991-10-01	36.423
1992-01-01	37.458
1992-04-01	39.376
1992-07-01	41.486
1992-10-01	40.883
1993-01-01	42.481
1993-04-01	43.358
1993-07-01	45.684
1993-10-01	43.408
1994-01-01	45.471
1994-04-01	47.390
1994-07-01	49.930
1994-10-01	51.659
1995-01-01	56.004
1995-04-01	58.698
1995-07-01	59.203
1995-10-01	61.136
1996-01-01	64.331
1996-04-01	65.366
1996-07-01	65.764
1996-10-01	67.761
1997-01-01	68.368
1997-04-01	69.222
1997-07-01	65.636
1997-10-01	60.719
1998-01-01	65.649
1998-04-01	63.907
1998-07-01	65.344
1998-10-01	69.766
1999-01-01	69.327
1999-04-01	72.076
1999-07-01	72.752
1999-10-01	75.583
2000-01-01	75.062
2000-04-01	75.546
2000-07-01	76.145
2000-10-01	77.536
2001-01-01	76.996
2001-04-01	76.673
2001-07-01	80.902
2001-10-01	80.532
2002-01-01	82.109
2002-04-01	85.480
2002-07-01	87.088
2002-10-01	90.326
2003-01-01	91.361
2003-04-01	91.799
2003-07-01	96.312
2003-10-01	99.707
2004-01-01	103.430
2004-04-01	101.161
2004-07-01	107.922
2004-10-01	114.169
2005-01-01	115.077
2005-04-01	115.900
2005-07-01	119.888
2005-10-01	120.210
2006-01-01	124.871
2006-04-01	131.133
2006-07-01	133.300
2006-10-01	134.584
2007-01-01	139.127
2007-04-01	145.621
2007-07-01	153.767
2007-10-01	162.836
2008-01-01	176.766
2008-04-01	184.286
2008-07-01	173.833
2008-10-01	177.406
2009-01-01	173.777
2009-04-01	190.524
2009-07-01	202.775
2009-10-01	207.948
2010-01-01	214.712
2010-04-01	219.315
2010-07-01	237.335
2010-10-01	250.454
2011-01-01	262.807
2011-04-01	278.469
2011-07-01	265.603
2011-10-01	272.346
2012-01-01	292.335
2012-04-01	292.658
2012-07-01	310.694
2012-10-01	315.288
2013-01-01	319.293
2013-04-01	310.376
2013-07-01	309.000
2013-10-01	309.184
2014-01-01	302.614
2014-04-01	303.129
2014-07-01	301.215
2014-10-01	292.795
2015-01-01	288.372
2015-04-01	302.872
2015-07-01	289.352
2015-10-01	297.509
2016-01-01	324.339
2016-04-01	327.552
2016-07-01	326.981
2016-10-01	320.486
2017-01-01	342.942
2017-04-01	351.123
2017-07-01	365.291
2017-10-01	375.737
2018-01-01	394.335