Quarter	Billions of US Dollars
1987-01-01	0.0580
1987-04-01	0.0970
1987-07-01	0.2440
1987-10-01	0.3170
1988-01-01	0.5930
1988-04-01	0.2130
1988-07-01	0.2420
1988-10-01	0.2940
1989-01-01	0.1570
1989-04-01	0.1410
1989-07-01	0.2260
1989-10-01	0.3300
1990-01-01	0.3510
1990-04-01	1.2130
1990-07-01	2.7520
1990-10-01	4.0650
1991-01-01	2.9490
1991-04-01	1.9610
1991-07-01	2.5210
1991-10-01	2.0010
1992-01-01	2.7470
1992-04-01	3.2510
1992-07-01	2.9480
1992-10-01	2.4550
1993-01-01	2.2420
1993-04-01	2.5310
1993-07-01	1.5587
1993-10-01	1.7874
1994-01-01	2.3243
1994-04-01	2.8015
1994-07-01	2.8629
1994-10-01	1.8139
1995-01-01	2.0649
1995-04-01	2.7496
1995-07-01	3.5867
1995-10-01	3.8874
1996-01-01	4.4736
1996-04-01	7.0439
1996-07-01	7.1701
1996-10-01	8.7112
1997-01-01	9.4340
1997-04-01	9.9299
1997-07-01	9.8054
1997-10-01	9.9375
1998-01-01	12.5759
1998-04-01	11.7925
1998-07-01	8.6658
1998-10-01	10.5336
1999-01-01	9.0963
1999-04-01	9.3608
1999-07-01	11.1030
1999-10-01	11.7345
2000-01-01	9.6801
2000-04-01	11.7657
2000-07-01	13.2564
2000-10-01	16.2344
2001-01-01	16.2398
2001-04-01	18.9017
2001-07-01	20.9350
2001-10-01	22.1208
2002-01-01	21.7876
2002-04-01	26.4717
2002-07-01	18.2127
2002-10-01	17.4612
2003-01-01	13.0685
2003-04-01	10.7493
2003-07-01	13.4812
2003-10-01	22.4876
2004-01-01	19.7855
2004-04-01	18.6668
2004-07-01	16.4344
2004-10-01	21.6221
2005-01-01	23.3558
2005-04-01	19.8473
2005-07-01	17.2573
2005-10-01	19.5600
2006-01-01	23.0077
2006-04-01	25.6522
2006-07-01	27.1813
2006-10-01	28.8499
2007-01-01	32.3899
2007-04-01	33.4867
2007-07-01	36.5198
2007-10-01	30.8411
2008-01-01	30.6133
2008-04-01	40.3612
2008-07-01	38.0219
2008-10-01	27.4286
2009-01-01	27.5458
2009-04-01	29.2434
2009-07-01	28.8821
2009-10-01	26.3836
2010-01-01	29.1699
2010-04-01	28.1903
2010-07-01	31.6280
2010-10-01	26.1188
2011-01-01	27.5617
2011-04-01	31.7745
2011-07-01	24.7971
2011-10-01	21.3081
2012-01-01	32.3954
2012-04-01	29.5864
2012-07-01	29.6839
2012-10-01	26.7887
2013-01-01	28.2540
2013-04-01	31.3032
2013-07-01	34.6934
2013-10-01	33.7352
2014-01-01	39.5828
2014-04-01	40.3945
2014-07-01	37.8484
2014-10-01	35.9415
2015-01-01	35.8470
2015-04-01	35.2561