Quarter	Billions of US Dollars
1987-01-01	0.516
1987-04-01	0.516
1987-07-01	0.515
1987-10-01	0.537
1988-01-01	0.544
1988-04-01	0.531
1988-07-01	0.615
1988-10-01	0.638
1989-01-01	0.619
1989-04-01	0.618
1989-07-01	2.149
1989-10-01	2.184
1990-01-01	2.364
1990-04-01	2.406
1990-07-01	2.465
1990-10-01	2.300
1991-01-01	2.242
1991-04-01	2.221
1991-07-01	2.524
1991-10-01	2.573
1992-01-01	2.518
1992-04-01	2.567
1992-07-01	2.623
1992-10-01	2.411
1993-01-01	2.530
1993-04-01	2.506
1993-07-01	2.428
1993-10-01	2.398
1994-01-01	2.486
1994-04-01	2.520
1994-07-01	2.397
1994-10-01	2.537
1995-01-01	3.352
1995-04-01	3.367
1995-07-01	3.497
1995-10-01	4.030
1996-01-01	4.229
1996-04-01	4.447
1996-07-01	5.966
1996-10-01	7.642
1997-01-01	10.322
1997-04-01	11.816
1997-07-01	13.095
1997-10-01	14.010
1998-01-01	13.730
1998-04-01	15.433
1998-07-01	17.596
1998-10-01	18.113
1999-01-01	19.322
1999-04-01	19.221
1999-07-01	20.710
1999-10-01	21.810
2000-01-01	23.063
2000-04-01	24.516
2000-07-01	24.434
2000-10-01	29.068
2001-01-01	31.502
2001-04-01	33.350
2001-07-01	32.184
2001-10-01	31.768
2002-01-01	34.719
2002-04-01	39.406
2002-07-01	36.869
2002-10-01	38.992
2003-01-01	49.554
2003-04-01	61.629
2003-07-01	66.623
2003-10-01	80.419
2004-01-01	95.060
2004-04-01	105.143
2004-07-01	118.871
2004-10-01	136.247
2005-01-01	147.094
2005-04-01	156.093
2005-07-01	163.973
2005-10-01	173.332
2006-01-01	185.496
2006-04-01	209.351
2006-07-01	225.473
2006-10-01	259.242
2007-01-01	277.534
2007-04-01	291.926
2007-07-01	319.558
2007-10-01	331.975
2008-01-01	369.126
2008-04-01	365.579
2008-07-01	326.458
2008-10-01	294.168
2009-01-01	266.832
2009-04-01	286.699
2009-07-01	316.614
2009-10-01	309.319
2010-01-01	311.474
2010-04-01	274.000
2010-07-01	267.851
2010-10-01	254.295
2011-01-01	264.298
2011-04-01	265.457
2011-07-01	230.150
2011-10-01	216.234
2012-01-01	207.240
2012-04-01	193.391
2012-07-01	175.096
2012-10-01	181.776
2013-01-01	176.553
2013-04-01	167.636
2013-07-01	162.061
2013-10-01	168.728
2014-01-01	165.482
2014-04-01	162.833
2014-07-01	146.180
2014-10-01	136.528
2015-01-01	115.637
2015-04-01	119.234