Quarter	Billions of US Dollars
1987-01-01	0.0170
1987-04-01	0.0060
1987-07-01	0.0040
1987-10-01	0.0070
1988-01-01	0.0130
1988-04-01	0.0110
1988-07-01	0.0030
1989-07-01	0.1280
1989-10-01	0.1850
1990-01-01	0.2360
1990-04-01	0.2280
1990-07-01	0.2080
1990-10-01	0.1440
1991-01-01	0.2440
1991-04-01	0.2210
1991-07-01	0.0570
1991-10-01	0.1890
1992-01-01	0.2470
1992-04-01	0.2710
1992-07-01	0.2730
1992-10-01	0.3470
1993-01-01	0.4660
1993-04-01	0.5300
1993-07-01	0.9563
1993-10-01	1.1795
1994-01-01	1.1075
1994-04-01	1.5268
1994-07-01	1.5748
1994-10-01	2.0323
1995-01-01	1.9417
1995-04-01	2.2242
1995-07-01	2.9712
1995-10-01	3.7614
1996-01-01	5.7223
1996-04-01	8.1802
1996-07-01	5.9262
1996-10-01	6.0868
1997-01-01	6.3928
1997-04-01	6.2528
1997-07-01	7.4572
1997-10-01	6.0409
1998-01-01	8.3905
1998-04-01	8.7158
1998-07-01	6.4270
1998-10-01	4.4278
1999-01-01	2.7194
1999-04-01	3.0794
1999-07-01	2.8836
1999-10-01	2.8151
2000-01-01	3.6652
2000-04-01	3.3274
2000-07-01	3.3675
2000-10-01	3.0891
2001-01-01	2.6358
2001-04-01	2.2103
2001-07-01	1.8177
2001-10-01	1.7021
2002-01-01	1.4599
2002-04-01	1.1161
2002-07-01	0.9461
2002-10-01	1.6034
2003-01-01	3.8486
2003-04-01	3.7996
2003-07-01	4.2774
2003-10-01	3.2758
2004-01-01	2.2822
2004-04-01	1.5772
2004-07-01	1.0433
2004-10-01	1.4273
2005-01-01	1.2721
2005-04-01	1.1614
2005-07-01	1.1020
2005-10-01	1.1090
2006-01-01	1.1618
2006-04-01	1.6707
2006-07-01	1.2013
2006-10-01	1.0611
2007-01-01	3.3502
2007-04-01	4.2217
2007-07-01	1.8117
2007-10-01	3.3547
2008-01-01	3.7198
2008-04-01	4.6254
2008-07-01	5.3699
2008-10-01	4.5803
2009-01-01	4.0458
2009-04-01	3.0473
2009-07-01	2.9793
2009-10-01	2.5333
2010-01-01	2.5501
2010-04-01	2.9391
2010-07-01	2.9276
2010-10-01	2.8381
2011-01-01	2.6826
2011-04-01	3.2979
2011-07-01	3.6018
2011-10-01	4.2633
2012-01-01	6.7423
2012-04-01	9.7351
2012-07-01	10.4883
2012-10-01	12.5046
2013-01-01	13.9418
2013-04-01	13.4484
2013-07-01	12.2797
2013-10-01	10.5618
2014-01-01	10.4670
2014-04-01	11.0130
2014-07-01	8.9025
2014-10-01	8.8834
2015-01-01	7.8073
2015-04-01	7.5178