Quarter	Billions of US Dollars
1987-01-01	0.406
1987-04-01	0.405
1987-07-01	0.407
1987-10-01	0.609
1988-01-01	0.595
1988-04-01	0.553
1988-07-01	0.542
1988-10-01	0.568
1989-01-01	0.539
1989-04-01	0.364
1989-07-01	0.405
1989-10-01	0.429
1990-01-01	0.432
1990-04-01	0.439
1990-07-01	0.554
1990-10-01	0.566
1991-01-01	0.523
1991-04-01	0.506
1991-07-01	1.105
1991-10-01	1.133
1992-01-01	1.106
1992-04-01	1.130
1992-07-01	1.069
1992-10-01	1.054
1993-01-01	1.251
1993-04-01	1.241
1993-07-01	1.302
1993-10-01	1.312
1994-01-01	1.595
1994-04-01	1.667
1994-07-01	1.819
1994-10-01	1.616
1995-01-01	1.652
1995-04-01	1.762
1995-07-01	2.506
1995-10-01	2.755
1996-01-01	2.998
1996-04-01	3.752
1996-07-01	4.200
1996-10-01	4.548
1997-01-01	5.538
1997-04-01	5.775
1997-07-01	6.641
1997-10-01	6.078
1998-01-01	6.340
1998-04-01	8.455
1998-07-01	7.788
1998-10-01	8.104
1999-01-01	8.310
1999-04-01	8.219
1999-07-01	8.412
1999-10-01	8.698
2000-01-01	7.730
2000-04-01	7.544
2000-07-01	7.848
2000-10-01	7.236
2001-01-01	8.653
2001-04-01	8.606
2001-07-01	8.996
2001-10-01	9.958
2002-01-01	9.729
2002-04-01	10.235
2002-07-01	9.686
2002-10-01	9.817
2003-01-01	11.245
2003-04-01	13.404
2003-07-01	15.295
2003-10-01	21.052
2004-01-01	21.656
2004-04-01	21.679
2004-07-01	22.047
2004-10-01	23.386
2005-01-01	23.223
2005-04-01	22.075
2005-07-01	22.401
2005-10-01	22.638
2006-01-01	22.991
2006-04-01	23.076
2006-07-01	22.963
2006-10-01	24.832
2007-01-01	25.973
2007-04-01	27.759
2007-07-01	27.498
2007-10-01	31.048
2008-01-01	28.766
2008-04-01	29.789
2008-07-01	29.314
2008-10-01	29.198
2009-01-01	28.562
2009-04-01	28.090
2009-07-01	28.865
2009-10-01	28.561
2010-01-01	29.445
2010-04-01	28.158
2010-07-01	33.625
2010-10-01	35.106
2011-01-01	37.696
2011-04-01	41.787
2011-07-01	42.584
2011-10-01	41.695
2012-01-01	41.650
2012-04-01	50.264
2012-07-01	53.578
2012-10-01	57.223
2013-01-01	57.177
2013-04-01	67.147
2013-07-01	66.420
2013-10-01	76.219
2014-01-01	79.765
2014-04-01	93.043
2014-07-01	100.292
2014-10-01	110.010
2015-01-01	119.299
2015-04-01	144.158