Quarter	Billions of US Dollars
1987-01-01	5.469
1987-04-01	6.675
1987-07-01	5.163
1987-10-01	0.980
1988-01-01	6.190
1988-04-01	9.137
1988-07-01	6.760
1988-10-01	9.339
1989-01-01	8.081
1989-04-01	6.619
1989-07-01	6.335
1989-10-01	9.820
1990-01-01	5.799
1990-04-01	6.359
1990-07-01	11.952
1990-10-01	8.397
1991-01-01	6.250
1991-04-01	9.433
1991-07-01	8.944
1991-10-01	6.778
1992-01-01	7.269
1992-04-01	3.517
1992-07-01	4.980
1992-10-01	2.763
1993-01-01	6.658
1993-04-01	10.287
1993-07-01	37.559
1993-10-01	16.854
1994-01-01	20.037
1994-04-01	17.309
1994-07-01	15.315
1994-10-01	10.078
1995-01-01	13.410
1995-04-01	17.737
1995-07-01	33.386
1995-10-01	24.793
1996-01-01	40.020
1996-04-01	43.375
1996-07-01	35.075
1996-10-01	59.694
1997-01-01	51.118
1997-04-01	49.178
1997-07-01	54.022
1997-10-01	43.340
1998-01-01	57.980
1998-04-01	83.680
1998-07-01	50.433
1998-10-01	34.093
1999-01-01	95.012
1999-04-01	119.265
1999-07-01	115.633
1999-10-01	57.869
2000-01-01	81.683
2000-04-01	95.532
2000-07-01	117.917
2000-10-01	149.768
2001-01-01	178.604
2001-04-01	155.850
2001-07-01	106.629
2001-10-01	173.095
2002-01-01	135.433
2002-04-01	145.966
2002-07-01	91.672
2002-10-01	98.228
2003-01-01	99.864
2003-04-01	102.331
2003-07-01	135.728
2003-10-01	163.686
2004-01-01	114.400
2004-04-01	131.178
2004-07-01	107.340
2004-10-01	137.693
2005-01-01	96.657
2005-04-01	155.843
2005-07-01	71.914
2005-10-01	229.536
2006-01-01	168.555
2006-04-01	278.928
2006-07-01	266.378
2006-10-01	415.315
2007-01-01	331.854
2007-04-01	438.784
2007-07-01	88.064
2007-10-01	125.033
2008-01-01	49.466
2008-04-01	267.725
2008-07-01	119.479
2008-10-01	322.172
2009-01-01	265.296
2009-04-01	181.885
2009-07-01	140.273
2009-10-01	114.481
2010-01-01	15.189
2010-04-01	-31.386
2010-07-01	52.683
2010-10-01	26.148
2011-01-01	-33.589
2011-04-01	-16.055
2011-07-01	14.793
2011-10-01	118.277
2012-01-01	116.915
2012-04-01	-63.587
2012-07-01	41.324
2012-10-01	112.783
2013-01-01	28.676
2013-04-01	56.908
2013-07-01	4.887
2013-10-01	16.565
2014-01-01	-7.049
2014-04-01	104.922
2014-07-01	48.536
2014-10-01	11.073
2015-01-01	97.666
2015-04-01	132.145