Quarter	Billions of US Dollars
1987-01-01	5.382
1987-04-01	5.635
1987-07-01	5.536
1987-10-01	6.452
1988-01-01	6.025
1988-04-01	5.820
1988-07-01	6.092
1988-10-01	6.396
1989-01-01	6.124
1989-04-01	6.019
1989-07-01	6.107
1989-10-01	6.284
1990-01-01	6.289
1990-04-01	6.143
1990-07-01	6.903
1990-10-01	7.108
1991-01-01	7.513
1991-04-01	8.519
1991-07-01	8.872
1991-10-01	9.166
1992-01-01	9.370
1992-04-01	9.905
1992-07-01	10.937
1992-10-01	10.409
1993-01-01	11.208
1993-04-01	11.840
1993-07-01	15.620
1993-10-01	15.677
1994-01-01	17.902
1994-04-01	19.465
1994-07-01	21.267
1994-10-01	21.894
1995-01-01	24.739
1995-04-01	26.471
1995-07-01	27.092
1995-10-01	28.716
1996-01-01	30.587
1996-04-01	32.239
1996-07-01	37.402
1996-10-01	42.101
1997-01-01	44.819
1997-04-01	48.618
1997-07-01	50.009
1997-10-01	48.046
1998-01-01	46.165
1998-04-01	45.122
1998-07-01	44.140
1998-10-01	44.281
1999-01-01	42.304
1999-04-01	41.158
1999-07-01	40.372
1999-10-01	40.728
2000-01-01	41.038
2000-04-01	40.357
2000-07-01	39.022
2000-10-01	37.115
2001-01-01	35.310
2001-04-01	33.781
2001-07-01	30.864
2001-10-01	30.367
2002-01-01	28.904
2002-04-01	29.560
2002-07-01	29.452
2002-10-01	30.025
2003-01-01	30.581
2003-04-01	33.624
2003-07-01	36.376
2003-10-01	38.875
2004-01-01	42.923
2004-04-01	44.545
2004-07-01	46.975
2004-10-01	51.706
2005-01-01	55.227
2005-04-01	56.174
2005-07-01	57.442
2005-10-01	62.715
2006-01-01	64.389
2006-04-01	70.263
2006-07-01	75.401
2006-10-01	79.568
2007-01-01	90.553
2007-04-01	100.306
2007-07-01	103.887
2007-10-01	108.174
2008-01-01	112.785
2008-04-01	116.212
2008-07-01	113.955
2008-10-01	105.892
2009-01-01	105.120
2009-04-01	111.493
2009-07-01	113.838
2009-10-01	111.550
2010-01-01	116.229
2010-04-01	116.513
2010-07-01	122.279
2010-10-01	132.972
2011-01-01	141.604
2011-04-01	153.153
2011-07-01	154.423
2011-10-01	161.106
2012-01-01	179.037
2012-04-01	184.164
2012-07-01	199.401
2012-10-01	201.387
2013-01-01	211.976
2013-04-01	220.520
2013-07-01	238.876
2013-10-01	259.227
2014-01-01	283.933
2014-04-01	306.609
2014-07-01	320.442
2014-10-01	344.708
2015-01-01	343.440
2015-04-01	352.554