Quarter	Billions of US Dollars
1987-01-01	1.753
1987-04-01	1.740
1987-07-01	1.864
1987-10-01	2.149
1988-01-01	2.207
1988-04-01	2.253
1988-07-01	2.325
1988-10-01	2.545
1989-01-01	2.438
1989-04-01	2.262
1989-07-01	2.331
1989-10-01	2.282
1990-01-01	2.148
1990-04-01	2.201
1990-07-01	2.368
1990-10-01	2.423
1991-01-01	2.310
1991-04-01	2.375
1991-07-01	2.460
1991-10-01	2.637
1992-01-01	2.343
1992-04-01	2.591
1992-07-01	2.874
1992-10-01	3.200
1993-01-01	3.063
1993-04-01	3.723
1993-07-01	6.276
1993-10-01	7.343
1994-01-01	8.200
1994-04-01	8.881
1994-07-01	9.295
1994-10-01	9.746
1995-01-01	9.926
1995-04-01	10.418
1995-07-01	10.998
1995-10-01	10.799
1996-01-01	11.624
1996-04-01	13.733
1996-07-01	16.442
1996-10-01	19.707
1997-01-01	20.735
1997-04-01	24.865
1997-07-01	29.669
1997-10-01	31.212
1998-01-01	32.424
1998-04-01	33.118
1998-07-01	32.554
1998-10-01	33.096
1999-01-01	32.882
1999-04-01	32.436
1999-07-01	32.776
1999-10-01	31.281
2000-01-01	31.442
2000-04-01	30.767
2000-07-01	29.353
2000-10-01	30.457
2001-01-01	28.854
2001-04-01	28.861
2001-07-01	28.662
2001-10-01	29.359
2002-01-01	29.935
2002-04-01	34.913
2002-07-01	36.581
2002-10-01	40.445
2003-01-01	39.646
2003-04-01	40.663
2003-07-01	43.052
2003-10-01	46.423
2004-01-01	48.164
2004-04-01	48.252
2004-07-01	49.439
2004-10-01	54.366
2005-01-01	56.568
2005-04-01	58.031
2005-07-01	59.316
2005-10-01	60.440
2006-01-01	65.459
2006-04-01	68.771
2006-07-01	72.443
2006-10-01	80.465
2007-01-01	82.433
2007-04-01	89.813
2007-07-01	90.896
2007-10-01	91.672
2008-01-01	93.442
2008-04-01	97.966
2008-07-01	101.649
2008-10-01	100.222
2009-01-01	98.575
2009-04-01	98.750
2009-07-01	110.058
2009-10-01	111.025
2010-01-01	110.030
2010-04-01	112.930
2010-07-01	124.401
2010-10-01	134.635
2011-01-01	145.486
2011-04-01	157.701
2011-07-01	159.080
2011-10-01	161.199
2012-01-01	168.411
2012-04-01	181.739
2012-07-01	186.189
2012-10-01	197.975
2013-01-01	209.509
2013-04-01	235.680
2013-07-01	240.878
2013-10-01	261.081
2014-01-01	275.241
2014-04-01	308.073
2014-07-01	319.266
2014-10-01	346.851
2015-01-01	364.312
2015-04-01	405.893