Quarter	Billions of US Dollars
1987-01-01	4.3405
1987-04-01	4.9976
1987-07-01	5.5934
1987-10-01	6.1635
1988-01-01	6.0804
1988-04-01	6.1942
1988-07-01	6.8900
1988-10-01	7.1726
1989-01-01	8.5103
1989-04-01	7.8969
1989-07-01	8.4396
1989-10-01	9.2070
1990-01-01	10.2100
1990-04-01	12.2054
1990-07-01	14.0230
1990-10-01	14.1959
1991-01-01	13.9544
1991-04-01	14.1216
1991-07-01	14.1987
1991-10-01	14.4403
1992-01-01	13.1776
1992-04-01	13.2686
1992-07-01	13.2866
1992-10-01	11.4098
1993-01-01	10.3528
1993-04-01	10.8229
1993-07-01	11.0123
1993-10-01	10.6189
1994-01-01	10.3749
1994-04-01	10.0537
1994-07-01	10.5796
1994-10-01	9.8101
1995-01-01	9.9882
1995-04-01	9.6417
1995-07-01	9.2081
1995-10-01	8.9556
1996-01-01	7.6664
1996-04-01	6.2475
1996-07-01	5.6705
1996-10-01	5.7397
1997-01-01	5.0567
1997-04-01	4.5206
1997-07-01	4.6697
1997-10-01	4.5004
1998-01-01	4.1808
1998-04-01	3.9248
1998-07-01	4.0858
1998-10-01	3.5505
1999-01-01	3.5956
1999-04-01	3.8391
1999-07-01	5.5299
1999-10-01	4.8129
2000-01-01	4.7489
2000-04-01	4.6414
2000-07-01	4.3285
2000-10-01	4.6809
2001-01-01	4.7710
2001-04-01	4.9305
2001-07-01	5.0059
2001-10-01	4.8411
2002-01-01	4.8954
2002-04-01	4.7896
2002-07-01	5.9048
2002-10-01	7.2591
2003-01-01	7.7368
2003-04-01	6.9618
2003-07-01	7.3222
2003-10-01	7.7698
2004-01-01	9.9934
2004-04-01	10.8880
2004-07-01	9.3991
2004-10-01	13.9380
2005-01-01	13.9064
2005-04-01	13.5291
2005-07-01	15.0567
2005-10-01	17.5944
2006-01-01	21.5686
2006-04-01	22.7075
2006-07-01	23.6255
2006-10-01	24.4659
2007-01-01	26.0798
2007-04-01	29.9453
2007-07-01	30.1541
2007-10-01	29.1216
2008-01-01	28.5196
2008-04-01	32.3474
2008-07-01	32.1482
2008-10-01	31.9736
2009-01-01	30.8660
2009-04-01	34.8572
2009-07-01	37.4129
2009-10-01	39.1948
2010-01-01	37.6051
2010-04-01	33.1465
2010-07-01	35.4636
2010-10-01	40.1058
2011-01-01	42.0090
2011-04-01	49.0267
2011-07-01	48.7772
2011-10-01	46.9896
2012-01-01	52.9244
2012-04-01	54.4615
2012-07-01	56.5383
2012-10-01	54.7755
2013-01-01	55.4771
2013-04-01	58.7160
2013-07-01	61.9682
2013-10-01	61.9139
2014-01-01	69.8798
2014-04-01	71.0232
2014-07-01	64.1539
2014-10-01	65.3371
2015-01-01	60.9899
2015-04-01	63.2866