Quarter	Billions of US Dollars
1987-01-01	2.9591
1987-04-01	2.9854
1987-07-01	3.8874
1987-10-01	4.1458
1988-01-01	4.7383
1988-04-01	4.8259
1988-07-01	5.0484
1988-10-01	5.1520
1989-01-01	5.0643
1989-04-01	5.1945
1989-07-01	6.1453
1989-10-01	7.4712
1990-01-01	7.6893
1990-04-01	8.7876
1990-07-01	9.6446
1990-10-01	10.8766
1991-01-01	10.6550
1991-04-01	10.4236
1991-07-01	10.8783
1991-10-01	11.5463
1992-01-01	11.0849
1992-04-01	11.6675
1992-07-01	11.3772
1992-10-01	10.7283
1993-01-01	10.6069
1993-04-01	10.8492
1993-07-01	11.5947
1993-10-01	10.3949
1994-01-01	10.4065
1994-04-01	10.7101
1994-07-01	9.5318
1994-10-01	9.4772
1995-01-01	10.2559
1995-04-01	10.5859
1995-07-01	10.3310
1995-10-01	10.5141
1996-01-01	10.6529
1996-04-01	10.6261
1996-07-01	10.9625
1996-10-01	10.8894
1997-01-01	10.7668
1997-04-01	11.3223
1997-07-01	11.1022
1997-10-01	11.2372
1998-01-01	11.3058
1998-04-01	11.5650
1998-07-01	11.7138
1998-10-01	11.9519
1999-01-01	12.0040
1999-04-01	12.5606
1999-07-01	14.1756
1999-10-01	15.0863
2000-01-01	15.1559
2000-04-01	16.8685
2000-07-01	17.3381
2000-10-01	16.2939
2001-01-01	16.7743
2001-04-01	18.2515
2001-07-01	18.2142
2001-10-01	18.8871
2002-01-01	20.2469
2002-04-01	22.5809
2002-07-01	23.1806
2002-10-01	24.1382
2003-01-01	25.3934
2003-04-01	25.4300
2003-07-01	26.9808
2003-10-01	29.5622
2004-01-01	31.6352
2004-04-01	33.2615
2004-07-01	32.4237
2004-10-01	34.3503
2005-01-01	33.5160
2005-04-01	33.5352
2005-07-01	35.3432
2005-10-01	32.9709
2006-01-01	33.0916
2006-04-01	34.5949
2006-07-01	33.9002
2006-10-01	36.1467
2007-01-01	36.2992
2007-04-01	37.2318
2007-07-01	41.2320
2007-10-01	44.2117
2008-01-01	49.0156
2008-04-01	47.4734
2008-07-01	48.0789
2008-10-01	52.0490
2009-01-01	46.5360
2009-04-01	48.4368
2009-07-01	50.3715
2009-10-01	52.5922
2010-01-01	53.5557
2010-04-01	55.6761
2010-07-01	57.9261
2010-10-01	58.6628
2011-01-01	60.4731
2011-04-01	59.8287
2011-07-01	62.1969
2011-10-01	59.7323
2012-01-01	58.5242
2012-04-01	56.7518
2012-07-01	56.0053
2012-10-01	50.8957
2013-01-01	50.1392
2013-04-01	48.6183
2013-07-01	50.3300
2013-10-01	47.8972
2014-01-01	48.4411
2014-04-01	47.1945
2014-07-01	46.4063
2014-10-01	48.7043
2015-01-01	48.1990
2015-04-01	45.8369