Quarter	Billions of US Dollars
1987-01-01	0.0590
1987-04-01	0.0970
1987-07-01	0.1070
1987-10-01	0.0470
1988-01-01	0.1000
1988-04-01	0.1360
1988-07-01	0.0770
1988-10-01	0.0460
1989-01-01	0.1080
1989-04-01	0.1140
1989-07-01	0.0980
1989-10-01	0.0640
1990-01-01	0.0530
1990-04-01	0.0840
1990-07-01	0.0650
1990-10-01	0.0730
1991-01-01	0.0700
1991-04-01	0.0650
1991-07-01	0.0480
1991-10-01	0.0450
1992-01-01	0.0550
1992-04-01	0.0450
1992-07-01	0.0350
1992-10-01	0.0150
1993-01-01	0.0100
1993-04-01	0.0100
1993-07-01	0.0150
1993-10-01	0.0100
1996-10-01	0.0300
1997-01-01	0.0300
1997-04-01	0.0300
1997-07-01	0.0300
1997-10-01	0.0300
1998-01-01	0.1050
1998-04-01	0.1050
1998-07-01	0.1050
1998-10-01	0.1050
1999-01-01	0.2650
1999-04-01	0.4090
1999-07-01	0.7224
1999-10-01	0.9008
2000-01-01	1.0764
2000-04-01	1.6035
2000-07-01	1.6320
2000-10-01	2.0220
2001-01-01	2.0481
2001-04-01	2.0312
2001-07-01	2.0765
2001-10-01	2.1554
2002-01-01	2.1706
2002-04-01	2.6485
2002-07-01	2.7046
2002-10-01	2.5918
2003-01-01	2.9712
2003-04-01	3.9589
2003-07-01	4.9928
2003-10-01	6.8785
2004-01-01	8.3563
2004-04-01	9.4111
2004-07-01	11.6354
2004-10-01	16.1034
2005-01-01	18.7874
2005-04-01	22.4329
2005-07-01	26.0681
2005-10-01	30.0151
2006-01-01	32.7219
2006-04-01	35.0889
2006-07-01	37.3333
2006-10-01	42.3158
2007-01-01	44.4801
2007-04-01	46.7630
2007-07-01	47.7950
2007-10-01	49.9972
2008-01-01	53.1434
2008-04-01	53.8412
2008-07-01	48.2884
2008-10-01	44.9475
2009-01-01	40.5611
2009-04-01	38.9661
2009-07-01	38.2010
2009-10-01	34.8299
2010-01-01	30.4435
2010-04-01	26.4005
2010-07-01	27.8058
2010-10-01	24.9389
2011-01-01	24.5958
2011-04-01	22.6629
2011-07-01	19.8832
2011-10-01	17.3401
2012-01-01	15.3443
2012-04-01	13.1634
2012-07-01	11.3462
2012-10-01	10.8391
2013-01-01	10.6085
2013-04-01	10.5525
2013-07-01	10.4150
2013-10-01	10.2988
2014-01-01	10.3573
2014-04-01	10.0379
2014-07-01	9.6027
2014-10-01	9.1906
2015-01-01	8.6354
2015-04-01	8.7676