Quarter	Billions of US Dollars
1987-01-01	0.2780
1987-04-01	0.6510
1987-07-01	0.2950
1987-10-01	0.4340
1988-01-01	0.3270
1988-04-01	0.3230
1988-07-01	0.2930
1988-10-01	0.6010
1989-01-01	0.5770
1989-04-01	0.5710
1989-07-01	0.6460
1989-10-01	0.7390
1990-01-01	1.5290
1990-04-01	1.7400
1990-07-01	2.0820
1990-10-01	1.7440
1991-01-01	2.0800
1991-04-01	2.0220
1991-07-01	1.7350
1991-10-01	1.6370
1992-01-01	2.3440
1992-04-01	2.3280
1992-07-01	1.9670
1992-10-01	1.9770
1993-01-01	1.9030
1993-04-01	1.8800
1993-07-01	12.2386
1993-10-01	11.7794
1994-01-01	11.8796
1994-04-01	12.4566
1994-07-01	12.9606
1994-10-01	13.1399
1995-01-01	13.1455
1995-04-01	16.1014
1995-07-01	16.2396
1995-10-01	15.1877
1996-01-01	14.5907
1996-04-01	15.1043
1996-07-01	16.3342
1996-10-01	18.9404
1997-01-01	17.4585
1997-04-01	16.7678
1997-07-01	18.7689
1997-10-01	17.9286
1998-01-01	15.3239
1998-04-01	12.6595
1998-07-01	14.6436
1998-10-01	15.3077
1999-01-01	13.4860
1999-04-01	12.9642
1999-07-01	14.0461
1999-10-01	14.1949
2000-01-01	11.7138
2000-04-01	11.7813
2000-07-01	11.6965
2000-10-01	13.3374
2001-01-01	11.7883
2001-04-01	12.1921
2001-07-01	12.2952
2001-10-01	11.4722
2002-01-01	9.7691
2002-04-01	13.0185
2002-07-01	12.3721
2002-10-01	12.3707
2003-01-01	12.9520
2003-04-01	13.0066
2003-07-01	12.7402
2003-10-01	14.4344
2004-01-01	16.0130
2004-04-01	16.7747
2004-07-01	15.6860
2004-10-01	14.8578
2005-01-01	16.2315
2005-04-01	16.2633
2005-07-01	17.5559
2005-10-01	13.7733
2006-01-01	15.4607
2006-04-01	13.7365
2006-07-01	14.8095
2006-10-01	14.3016
2007-01-01	16.2426
2007-04-01	18.3706
2007-07-01	12.4639
2007-10-01	15.8127
2008-01-01	20.1688
2008-04-01	22.0165
2008-07-01	17.1484
2008-10-01	16.9284
2009-01-01	15.8945
2009-04-01	18.6122
2009-07-01	19.9907
2009-10-01	18.3095
2010-01-01	18.8059
2010-04-01	14.5276
2010-07-01	18.9601
2010-10-01	19.5306
2011-01-01	22.2751
2011-04-01	21.8078
2011-07-01	25.9008
2011-10-01	27.4912
2012-01-01	43.2751
2012-04-01	45.0385
2012-07-01	44.9477
2012-10-01	44.9180
2013-01-01	43.6698
2013-04-01	45.7734
2013-07-01	48.1258
2013-10-01	51.7862
2014-01-01	45.1056
2014-04-01	52.4503
2014-07-01	54.7822
2014-10-01	54.9651
2015-01-01	44.8027
2015-04-01	46.2271