Quarter	Billions of US Dollars
1987-01-01	7.592
1987-04-01	7.311
1987-07-01	4.692
1987-10-01	3.081
1988-01-01	6.908
1988-04-01	10.984
1988-07-01	10.225
1988-10-01	8.599
1989-01-01	18.126
1989-04-01	7.889
1989-07-01	9.344
1989-10-01	8.614
1990-01-01	10.616
1990-04-01	2.847
1990-07-01	11.498
1990-10-01	4.445
1991-01-01	5.902
1991-04-01	7.566
1991-07-01	4.406
1991-10-01	5.214
1992-01-01	1.158
1992-04-01	4.688
1992-07-01	5.467
1992-10-01	7.214
1993-01-01	-0.737
1993-04-01	0.228
1993-07-01	45.871
1993-10-01	22.583
1994-01-01	23.672
1994-04-01	8.028
1994-07-01	26.309
1994-10-01	24.108
1995-01-01	26.527
1995-04-01	20.115
1995-07-01	28.255
1995-10-01	30.907
1996-01-01	35.333
1996-04-01	47.066
1996-07-01	42.665
1996-10-01	49.630
1997-01-01	53.603
1997-04-01	42.262
1997-07-01	57.078
1997-10-01	16.553
1998-01-01	52.237
1998-04-01	44.816
1998-07-01	43.735
1998-10-01	7.224
1999-01-01	79.583
1999-04-01	71.705
1999-07-01	93.993
1999-10-01	56.974
2000-01-01	89.109
2000-04-01	85.037
2000-07-01	65.608
2000-10-01	71.684
2001-01-01	111.566
2001-04-01	69.152
2001-07-01	31.016
2001-10-01	49.900
2002-01-01	54.348
2002-04-01	91.426
2002-07-01	20.689
2002-10-01	33.557
2003-01-01	122.322
2003-04-01	103.646
2003-07-01	79.977
2003-10-01	163.966
2004-01-01	208.340
2004-04-01	93.738
2004-07-01	172.665
2004-10-01	166.721
2005-01-01	232.425
2005-04-01	198.121
2005-07-01	121.573
2005-10-01	174.949
2006-01-01	274.159
2006-04-01	165.446
2006-07-01	186.348
2006-10-01	282.699
2007-01-01	355.599
2007-04-01	347.492
2007-07-01	175.044
2007-10-01	153.407
2008-01-01	190.173
2008-04-01	418.729
2008-07-01	55.658
2008-10-01	-3.267
2009-01-01	-59.913
2009-04-01	95.274
2009-07-01	97.105
2009-10-01	-24.802
2010-01-01	187.978
2010-04-01	-91.165
2010-07-01	101.616
2010-10-01	-82.766
2011-01-01	128.351
2011-04-01	7.113
2011-07-01	-89.718
2011-10-01	-139.529
2012-01-01	75.890
2012-04-01	-128.344
2012-07-01	-102.863
2012-10-01	-98.611
2013-01-01	-112.892
2013-04-01	-93.202
2013-07-01	-44.293
2013-10-01	25.901
2014-01-01	-73.193
2014-04-01	3.636
2014-07-01	17.458
2014-10-01	-66.880
2015-01-01	30.268
2015-04-01	-20.381