Quarter	Billions of US Dollars
1987-01-01	1.4333
1987-04-01	1.6244
1987-07-01	1.7307
1987-10-01	2.1399
1988-01-01	2.2361
1988-04-01	2.1564
1988-07-01	2.2589
1988-10-01	2.4630
1989-01-01	2.3880
1989-04-01	2.4134
1989-07-01	2.4669
1989-10-01	2.4463
1990-01-01	2.3308
1990-04-01	2.3677
1990-07-01	2.5183
1990-10-01	2.5636
1991-01-01	2.4670
1991-04-01	2.4867
1991-07-01	2.7070
1991-10-01	2.8239
1992-01-01	2.7055
1992-04-01	2.7501
1992-07-01	2.9996
1992-10-01	2.8531
1993-01-01	2.9747
1993-04-01	3.1847
1993-07-01	3.6131
1993-10-01	3.5069
1994-01-01	4.1728
1994-04-01	4.4125
1994-07-01	4.7731
1994-10-01	4.8605
1995-01-01	5.3570
1995-04-01	5.2946
1995-07-01	4.8659
1995-10-01	4.4620
1996-01-01	4.6666
1996-04-01	4.5231
1996-07-01	4.0152
1996-10-01	3.9260
1997-01-01	4.1300
1997-04-01	4.8031
1997-07-01	4.6310
1997-10-01	4.5122
1998-01-01	4.4822
1998-04-01	3.8277
1998-07-01	3.4317
1998-10-01	3.4769
1999-01-01	3.0195
1999-04-01	3.4919
1999-07-01	3.4478
1999-10-01	3.6946
2000-01-01	3.5216
2000-04-01	3.5822
2000-07-01	3.4988
2000-10-01	3.4635
2001-01-01	3.4215
2001-04-01	3.3028
2001-07-01	3.1753
2001-10-01	3.5215
2002-01-01	4.5191
2002-04-01	4.0450
2002-07-01	3.8207
2002-10-01	3.5302
2003-01-01	3.5297
2003-04-01	3.5303
2003-07-01	3.5653
2003-10-01	3.5756
2004-01-01	3.7331
2004-04-01	3.4223
2004-07-01	4.4158
2004-10-01	5.2763
2005-01-01	5.2463
2005-04-01	5.0102
2005-07-01	6.5020
2005-10-01	7.4832
2006-01-01	7.2389
2006-04-01	7.2587
2006-07-01	7.2537
2006-10-01	7.2702
2007-01-01	7.4950
2007-04-01	8.0511
2007-07-01	9.4044
2007-10-01	9.4596
2008-01-01	9.5508
2008-04-01	9.5824
2008-07-01	11.2915
2008-10-01	11.2712
2009-01-01	11.2508
2009-04-01	10.7795
2009-07-01	11.6761
2009-10-01	11.6688
2010-01-01	11.6399
2010-04-01	11.2681
2010-07-01	9.7312
2010-10-01	10.5778
2011-01-01	10.6130
2011-04-01	10.6590
2011-07-01	7.9417
2011-10-01	7.9021
2012-01-01	8.4644
2012-04-01	9.7165
2012-07-01	10.8079
2012-10-01	11.0918
2013-01-01	11.5893
2013-04-01	11.6814
2013-07-01	11.6013
2013-10-01	12.5151
2014-01-01	14.1894
2014-04-01	15.8780
2014-07-01	18.9048
2014-10-01	38.1401
2015-01-01	37.6519
2015-04-01	39.4695