Quarter	Billions of US Dollars
1990-10-01	20.887
1991-01-01	21.315
1991-04-01	21.971
1991-07-01	22.070
1991-10-01	22.137
1992-01-01	22.375
1992-04-01	22.581
1992-07-01	23.367
1992-10-01	23.951
1993-01-01	24.142
1993-04-01	24.203
1993-07-01	24.404
1993-10-01	24.778
1994-01-01	25.127
1994-04-01	25.458
1994-07-01	25.973
1994-10-01	26.583
1995-01-01	27.444
1995-04-01	28.168
1995-07-01	28.142
1995-10-01	28.105
1996-01-01	28.107
1996-04-01	27.325
1996-07-01	27.048
1996-10-01	26.595
1997-01-01	27.421
1997-04-01	30.010
1997-07-01	31.400
1997-10-01	18.218
1998-01-01	24.614
1998-04-01	27.167
1998-07-01	29.129
1998-10-01	36.359
1999-01-01	37.917
1999-04-01	42.604
1999-07-01	42.835
1999-10-01	48.502
2000-01-01	51.223
2000-04-01	52.366
2000-07-01	53.890
2000-10-01	48.837
2001-01-01	47.815
2001-04-01	50.369
2001-07-01	51.662
2001-10-01	52.527
2002-01-01	53.648
2002-04-01	60.955
2002-07-01	60.809
2002-10-01	64.082
2003-01-01	63.278
2003-04-01	68.224
2003-07-01	77.539
2003-10-01	82.443
2004-01-01	102.461
2004-04-01	108.264
2004-07-01	119.288
2004-10-01	139.787
2005-01-01	166.621
2005-04-01	179.069
2005-07-01	172.226
2005-10-01	179.476
2006-01-01	207.211
2006-04-01	224.847
2006-07-01	236.056
2006-10-01	235.651
2007-01-01	241.501
2007-04-01	252.454
2007-07-01	252.032
2007-10-01	249.906
2008-01-01	246.444
2008-04-01	237.445
2008-07-01	197.410
2008-10-01	199.839
2009-01-01	209.718
2009-04-01	241.044
2009-07-01	266.177
2009-10-01	264.377
2010-01-01	311.395
2010-04-01	296.356
2010-07-01	328.798
2010-10-01	322.048
2011-01-01	353.503
2011-04-01	369.463
2011-07-01	339.037
2011-10-01	352.301
2012-01-01	385.433
2012-04-01	394.410
2012-07-01	413.138
2012-10-01	431.560
2013-01-01	450.057
2013-04-01	449.040
2013-07-01	474.602
2013-10-01	478.797
2014-01-01	508.364
2014-04-01	554.658
2014-07-01	537.307
2014-10-01	520.456
2015-01-01	555.956
2015-04-01	560.542
2015-07-01	543.499
2015-10-01	535.494
2016-01-01	588.902
2016-04-01	593.666
2016-07-01	619.457
2016-10-01	545.111
2017-01-01	606.914
2017-04-01	596.972
2017-07-01	582.528
2017-10-01	617.355
2018-01-01	629.842