Quarter	Billions of US Dollars
1990-10-01	12.551
1991-01-01	12.889
1991-04-01	12.965
1991-07-01	13.000
1991-10-01	12.939
1992-01-01	13.546
1992-04-01	13.863
1992-07-01	14.263
1992-10-01	14.180
1993-01-01	15.195
1993-04-01	15.664
1993-07-01	16.711
1993-10-01	17.677
1994-01-01	18.535
1994-04-01	20.293
1994-07-01	21.437
1994-10-01	23.730
1995-01-01	24.753
1995-04-01	26.515
1995-07-01	27.169
1995-10-01	28.280
1996-01-01	30.610
1996-04-01	32.594
1996-07-01	34.105
1996-10-01	35.815
1997-01-01	36.387
1997-04-01	36.292
1997-07-01	35.247
1997-10-01	33.095
1998-01-01	32.085
1998-04-01	30.252
1998-07-01	29.821
1998-10-01	32.220
1999-01-01	33.178
1999-04-01	34.094
1999-07-01	34.360
1999-10-01	35.374
2000-01-01	34.219
2000-04-01	33.107
2000-07-01	29.066
2000-10-01	32.261
2001-01-01	29.886
2001-04-01	30.530
2001-07-01	31.358
2001-10-01	32.725
2002-01-01	35.373
2002-04-01	40.184
2002-07-01	39.482
2002-10-01	45.419
2003-01-01	49.255
2003-04-01	53.834
2003-07-01	57.058
2003-10-01	65.695
2004-01-01	69.037
2004-04-01	67.930
2004-07-01	74.635
2004-10-01	83.222
2005-01-01	84.972
2005-04-01	86.018
2005-07-01	88.455
2005-10-01	90.718
2006-01-01	83.576
2006-04-01	85.703
2006-07-01	94.130
2006-10-01	105.093
2007-01-01	110.427
2007-04-01	123.053
2007-07-01	123.451
2007-10-01	129.619
2008-01-01	134.661
2008-04-01	131.814
2008-07-01	117.460
2008-10-01	100.234
2009-01-01	100.167
2009-04-01	115.250
2009-07-01	128.232
2009-10-01	130.292
2010-01-01	127.719
2010-04-01	125.063
2010-07-01	134.385
2010-10-01	141.300
2011-01-01	139.440
2011-04-01	151.593
2011-07-01	140.269
2011-10-01	142.097
2012-01-01	151.935
2012-04-01	149.058
2012-07-01	156.394
2012-10-01	156.524
2013-01-01	161.357
2013-04-01	152.478
2013-07-01	164.265
2013-10-01	165.496
2014-01-01	176.048
2014-04-01	180.160
2014-07-01	161.350
2014-10-01	164.698
2015-01-01	159.874
2015-04-01	146.947
2015-07-01	141.127
2015-10-01	154.273
2016-01-01	159.323
2016-04-01	167.352
2016-07-01	174.821
2016-10-01	171.021
2017-01-01	174.269
2017-04-01	185.907
2017-07-01	185.070
2017-10-01	185.314
2018-01-01	190.347