Quarter	Billions of US Dollars
1989-07-01	2.193
1989-10-01	2.061
1990-01-01	2.525
1990-04-01	3.617
1990-07-01	4.643
1990-10-01	5.734
1991-01-01	6.223
1991-04-01	6.692
1991-07-01	9.406
1991-10-01	9.847
1992-01-01	12.364
1992-04-01	9.679
1992-07-01	7.255
1992-10-01	6.895
1993-01-01	6.020
1993-04-01	6.665
1993-07-01	3.049
1993-10-01	3.056
1994-01-01	3.526
1994-04-01	4.693
1994-07-01	5.217
1994-10-01	6.591
1995-01-01	8.697
1995-04-01	10.478
1995-07-01	9.476
1995-10-01	10.454
1996-01-01	11.128
1996-04-01	10.690
1996-07-01	11.204
1996-10-01	11.933
1997-01-01	11.611
1997-04-01	9.266
1997-07-01	10.199
1997-10-01	12.297
1998-01-01	10.103
1998-04-01	10.312
1998-07-01	14.094
1998-10-01	20.565
1999-01-01	34.623
1999-04-01	33.459
1999-07-01	46.016
1999-10-01	46.526
2000-01-01	48.122
2000-04-01	52.472
2000-07-01	52.477
2000-10-01	61.223
2001-01-01	71.029
2001-04-01	64.534
2001-07-01	65.503
2001-10-01	69.172
2002-01-01	79.537
2002-04-01	81.374
2002-07-01	94.467
2002-10-01	110.131
2003-01-01	137.238
2003-04-01	153.692
2003-07-01	144.815
2003-10-01	182.816
2004-01-01	176.385
2004-04-01	174.865
2004-07-01	196.563
2004-10-01	212.648
2005-01-01	228.007
2005-04-01	221.101
2005-07-01	212.878
2005-10-01	198.211
2006-01-01	227.046
2006-04-01	266.772
2006-07-01	268.942
2006-10-01	264.365
2007-01-01	322.917
2007-04-01	357.065
2007-07-01	329.232
2007-10-01	280.957
2008-01-01	363.949
2008-04-01	379.642
2008-07-01	360.912
2008-10-01	317.305
2009-01-01	303.918
2009-04-01	315.805
2009-07-01	342.669
2009-10-01	282.088
2010-01-01	270.400
2010-04-01	237.175
2010-07-01	265.548
2010-10-01	217.920
2011-01-01	233.548
2011-04-01	229.532
2011-07-01	234.613
2011-10-01	226.010
2012-01-01	258.396
2012-04-01	224.335
2012-07-01	204.872
2012-10-01	165.454
2013-01-01	163.153
2013-04-01	162.650
2013-07-01	173.718
2013-10-01	161.892
2014-01-01	178.387
2014-04-01	188.685
2014-07-01	182.214
2014-10-01	168.474
2015-01-01	170.786
2015-04-01	164.856