Quarter	Billions of US Dollars
1987-01-01	0.1100
1987-04-01	0.1390
1987-07-01	0.1300
1987-10-01	0.4000
1988-01-01	0.3740
1988-04-01	0.2910
1988-07-01	0.2870
1988-10-01	0.1090
1989-01-01	0.1510
1989-04-01	0.0620
1989-07-01	0.1140
1989-10-01	0.1520
1990-01-01	0.2070
1990-04-01	0.3050
1990-07-01	0.6660
1990-10-01	0.4900
1991-01-01	0.4160
1991-04-01	0.3500
1991-07-01	0.4590
1991-10-01	0.2080
1992-01-01	0.1970
1992-04-01	0.1040
1992-07-01	0.1940
1992-10-01	0.0520
1993-01-01	0.1210
1993-04-01	0.1790
1993-07-01	0.1467
1993-10-01	0.1179
1994-01-01	0.0778
1994-04-01	0.0407
1994-07-01	0.0394
1994-10-01	0.0750
1995-01-01	0.3930
1995-04-01	0.1473
1995-07-01	0.1458
1995-10-01	0.1695
1996-01-01	0.3289
1996-04-01	0.2179
1996-07-01	0.1077
1996-10-01	0.0882
1997-01-01	0.0942
1997-04-01	0.1362
1997-07-01	0.1118
1997-10-01	0.2214
1998-01-01	0.4695
1998-04-01	0.3138
1998-07-01	0.8321
1998-10-01	0.4497
1999-01-01	2.1111
1999-04-01	2.5715
1999-07-01	2.0966
1999-10-01	2.9851
2000-01-01	3.7648
2000-04-01	6.4098
2000-07-01	3.8140
2000-10-01	3.7836
2001-01-01	4.9723
2001-04-01	3.4840
2001-07-01	5.8828
2001-10-01	8.1460
2002-01-01	9.5605
2002-04-01	8.8536
2002-07-01	9.4061
2002-10-01	12.6672
2003-01-01	13.7386
2003-04-01	16.0010
2003-07-01	14.0155
2003-10-01	13.4109
2004-01-01	17.0753
2004-04-01	17.4597
2004-07-01	22.1325
2004-10-01	25.7202
2005-01-01	31.1637
2005-04-01	29.8483
2005-07-01	32.4235
2005-10-01	33.2715
2006-01-01	36.4650
2006-04-01	38.5623
2006-07-01	46.2862
2006-10-01	48.4558
2007-01-01	58.4259
2007-04-01	55.6440
2007-07-01	67.4383
2007-10-01	41.3786
2008-01-01	53.6737
2008-04-01	55.8467
2008-07-01	54.5466
2008-10-01	64.4611
2009-01-01	59.3436
2009-04-01	55.9596
2009-07-01	55.2442
2009-10-01	50.5092
2010-01-01	38.7688
2010-04-01	40.8768
2010-07-01	36.7713
2010-10-01	43.4599
2011-01-01	22.4167
2011-04-01	16.1646
2011-07-01	13.2243
2011-10-01	9.7534
2012-01-01	47.2602
2012-04-01	58.7252
2012-07-01	48.3123
2012-10-01	49.0071
2013-01-01	42.4631
2013-04-01	39.6446
2013-07-01	39.8838
2013-10-01	40.3692
2014-01-01	5.1534
2014-04-01	5.1827
2014-07-01	6.1279
2014-10-01	6.7034
2015-01-01	7.2148
2015-04-01	6.7139