Quarter	Billions of US Dollars
1987-01-01	2.8140
1987-04-01	3.4530
1987-07-01	3.8190
1987-10-01	3.7430
1988-01-01	4.1920
1988-04-01	4.5360
1988-07-01	4.3890
1988-10-01	3.7560
1989-01-01	4.3880
1989-04-01	4.3290
1989-07-01	4.6870
1989-10-01	3.6320
1990-01-01	4.7720
1990-04-01	5.7970
1990-07-01	7.2490
1990-10-01	6.3160
1991-01-01	5.6980
1991-04-01	4.6680
1991-07-01	5.1740
1991-10-01	4.7710
1992-01-01	4.7700
1992-04-01	5.1640
1992-07-01	6.2230
1992-10-01	8.0550
1993-01-01	7.1290
1993-04-01	8.1140
1993-07-01	8.3217
1993-10-01	8.4184
1994-01-01	9.2979
1994-04-01	8.9482
1994-07-01	9.2055
1994-10-01	10.0828
1995-01-01	8.1212
1995-04-01	8.2086
1995-07-01	8.2145
1995-10-01	7.7373
1996-01-01	7.7060
1996-04-01	12.4504
1996-07-01	6.9627
1996-10-01	8.1325
1997-01-01	6.8937
1997-04-01	8.2181
1997-07-01	8.2074
1997-10-01	7.8122
1998-01-01	7.1321
1998-04-01	9.7559
1998-07-01	10.2533
1998-10-01	10.3484
1999-01-01	9.7807
1999-04-01	10.4961
1999-07-01	11.7863
1999-10-01	10.2365
2000-01-01	12.8362
2000-04-01	11.6741
2000-07-01	13.2026
2000-10-01	15.7308
2001-01-01	13.7515
2001-04-01	12.5534
2001-07-01	11.1963
2001-10-01	8.7000
2002-01-01	8.7242
2002-04-01	9.3080
2002-07-01	10.6139
2002-10-01	8.7447
2003-01-01	9.5191
2003-04-01	8.6027
2003-07-01	8.0320
2003-10-01	7.9928
2004-01-01	11.2800
2004-04-01	10.1137
2004-07-01	11.8176
2004-10-01	11.0758
2005-01-01	12.3028
2005-04-01	18.1733
2005-07-01	16.6631
2005-10-01	15.5795
2006-01-01	17.2297
2006-04-01	16.8283
2006-07-01	16.4145
2006-10-01	18.2112
2007-01-01	20.7883
2007-04-01	23.5294
2007-07-01	24.6671
2007-10-01	33.0215
2008-01-01	37.9279
2008-04-01	42.1273
2008-07-01	47.5330
2008-10-01	36.2993
2009-01-01	37.4893
2009-04-01	42.2687
2009-07-01	45.1591
2009-10-01	42.4750
2010-01-01	46.1261
2010-04-01	40.6490
2010-07-01	38.2527
2010-10-01	39.5688
2011-01-01	34.6739
2011-04-01	35.6027
2011-07-01	41.3969
2011-10-01	43.9428
2012-01-01	44.4211
2012-04-01	41.9698
2012-07-01	41.8951
2012-10-01	47.1417
2013-01-01	49.8151
2013-04-01	40.9330
2013-07-01	47.0964
2013-10-01	38.7825
2014-01-01	35.7871
2014-04-01	45.3165
2014-07-01	43.8638
2014-10-01	48.9392
2015-01-01	35.4866
2015-04-01	33.3109