Quarter	Billions of US Dollars
1987-01-01	7.721
1987-04-01	7.381
1987-07-01	4.642
1987-10-01	3.140
1988-01-01	6.638
1988-04-01	10.987
1988-07-01	10.783
1988-10-01	8.710
1989-01-01	18.446
1989-04-01	7.970
1989-07-01	9.820
1989-10-01	8.884
1990-01-01	10.873
1990-04-01	2.456
1990-07-01	11.707
1990-10-01	4.496
1991-01-01	6.596
1991-04-01	8.645
1991-07-01	4.633
1991-10-01	5.412
1992-01-01	2.070
1992-04-01	5.587
1992-07-01	6.039
1992-10-01	7.834
1993-01-01	0.143
1993-04-01	1.084
1993-07-01	52.733
1993-10-01	24.884
1994-01-01	27.933
1994-04-01	10.256
1994-07-01	28.266
1994-10-01	25.582
1995-01-01	25.204
1995-04-01	21.712
1995-07-01	31.328
1995-10-01	33.254
1996-01-01	39.124
1996-04-01	53.165
1996-07-01	43.927
1996-10-01	55.876
1997-01-01	58.313
1997-04-01	46.388
1997-07-01	62.984
1997-10-01	13.052
1998-01-01	53.540
1998-04-01	46.382
1998-07-01	39.825
1998-10-01	3.704
1999-01-01	76.805
1999-04-01	71.287
1999-07-01	92.948
1999-10-01	57.572
2000-01-01	91.365
2000-04-01	84.163
2000-07-01	64.421
2000-10-01	70.507
2001-01-01	110.504
2001-04-01	69.793
2001-07-01	27.183
2001-10-01	49.380
2002-01-01	53.246
2002-04-01	91.861
2002-07-01	20.035
2002-10-01	33.872
2003-01-01	124.849
2003-04-01	108.011
2003-07-01	81.608
2003-10-01	167.672
2004-01-01	214.375
2004-04-01	96.516
2004-07-01	177.502
2004-10-01	173.203
2005-01-01	238.220
2005-04-01	204.231
2005-07-01	127.513
2005-10-01	189.772
2006-01-01	281.967
2006-04-01	178.541
2006-07-01	197.002
2006-10-01	299.297
2007-01-01	379.042
2007-04-01	372.891
2007-07-01	176.121
2007-10-01	160.816
2008-01-01	198.236
2008-04-01	431.900
2008-07-01	55.330
2008-10-01	-17.434
2009-01-01	-64.941
2009-04-01	99.405
2009-07-01	101.113
2009-10-01	-22.944
2010-01-01	198.951
2010-04-01	-91.117
2010-07-01	125.175
2010-10-01	-60.093
2011-01-01	148.146
2011-04-01	30.263
2011-07-01	-85.729
2011-10-01	-127.100
2012-01-01	117.039
2012-04-01	-111.463
2012-07-01	-50.812
2012-10-01	-58.732
2013-01-01	-77.303
2013-04-01	-66.872
2013-07-01	-16.001
2013-10-01	61.803
2014-01-01	-41.534
2014-04-01	44.363
2014-07-01	46.817
2014-10-01	-38.693
2015-01-01	26.129
2015-04-01	-6.058