Quarter	Billions of US Dollars
1987-01-01	0.3160
1987-04-01	0.3860
1987-07-01	0.4420
1987-10-01	0.4950
1988-01-01	0.5540
1988-04-01	0.5370
1988-07-01	0.5430
1988-10-01	0.5180
1989-01-01	0.4730
1989-04-01	0.4560
1989-07-01	0.3910
1989-10-01	0.3650
1990-01-01	0.2510
1990-04-01	0.2600
1990-07-01	0.1560
1990-10-01	0.0900
1991-01-01	0.0780
1991-04-01	0.0650
1991-07-01	0.0250
1993-07-01	0.0432
1993-10-01	0.0015
1994-01-01	0.0170
1994-04-01	0.0350
1994-07-01	0.0195
1994-10-01	0.0020
1995-01-01	0.0030
1995-04-01	0.0180
1995-07-01	0.0030
1995-10-01	0.6727
1996-01-01	0.1283
1996-04-01	0.2928
1996-07-01	0.1703
1996-10-01	0.1750
1997-01-01	0.5697
1997-04-01	0.5694
1997-07-01	0.6905
1997-10-01	0.5348
1998-01-01	0.6387
1998-04-01	0.2650
1998-07-01	0.1907
1998-10-01	0.0552
1999-01-01	0.5292
1999-04-01	0.2129
1999-07-01	0.3602
1999-10-01	1.5845
2000-01-01	1.8673
2000-04-01	1.5381
2000-07-01	1.6964
2000-10-01	2.2250
2001-01-01	2.2992
2001-04-01	2.6820
2001-07-01	3.6950
2001-10-01	3.8876
2002-01-01	4.3810
2002-04-01	4.5055
2002-07-01	4.8911
2002-10-01	4.8749
2003-01-01	5.5021
2003-04-01	8.8502
2003-07-01	9.7020
2003-10-01	8.3662
2004-01-01	9.2111
2004-04-01	9.9140
2004-07-01	8.7360
2004-10-01	10.0503
2005-01-01	9.7307
2005-04-01	9.3696
2005-07-01	8.7201
2005-10-01	9.7474
2006-01-01	9.2018
2006-04-01	11.9710
2006-07-01	14.8894
2006-10-01	17.0852
2007-01-01	16.5901
2007-04-01	20.7731
2007-07-01	22.7212
2007-10-01	23.1742
2008-01-01	25.2857
2008-04-01	28.9650
2008-07-01	25.1697
2008-10-01	19.8464
2009-01-01	20.6631
2009-04-01	24.8535
2009-07-01	26.7848
2009-10-01	25.8137
2010-01-01	26.8102
2010-04-01	15.4711
2010-07-01	14.9791
2010-10-01	9.1889
2011-01-01	9.9059
2011-04-01	9.0894
2011-07-01	8.8362
2011-10-01	8.5861
2012-01-01	6.1174
2012-04-01	5.7652
2012-07-01	5.3350
2012-10-01	8.4409
2013-01-01	7.3212
2013-04-01	6.1992
2013-07-01	5.6907
2013-10-01	4.4395
2014-01-01	2.8082
2014-04-01	2.9316
2014-07-01	1.5940
2014-10-01	0.5883
2015-01-01	0.4842
2015-04-01	0.4104