Quarter	Billions of US Dollars
1987-01-01	26.860
1987-04-01	28.161
1987-07-01	28.213
1987-10-01	30.971
1988-01-01	32.248
1988-04-01	33.696
1988-07-01	33.824
1988-10-01	35.670
1989-01-01	37.531
1989-04-01	37.282
1989-07-01	38.602
1989-10-01	40.057
1990-01-01	41.616
1990-04-01	43.432
1990-07-01	47.892
1990-10-01	50.035
1991-01-01	47.946
1991-04-01	50.082
1991-07-01	54.886
1991-10-01	61.879
1992-01-01	61.228
1992-04-01	64.639
1992-07-01	68.349
1992-10-01	65.536
1993-01-01	65.261
1993-04-01	61.837
1993-07-01	69.228
1993-10-01	69.480
1994-01-01	73.594
1994-04-01	74.331
1994-07-01	78.388
1994-10-01	78.318
1995-01-01	82.900
1995-04-01	83.084
1995-07-01	81.961
1995-10-01	83.668
1996-01-01	82.105
1996-04-01	86.177
1996-07-01	87.606
1996-10-01	85.984
1997-01-01	86.473
1997-04-01	82.151
1997-07-01	84.629
1997-10-01	82.082
1998-01-01	83.486
1998-04-01	82.190
1998-07-01	86.931
1998-10-01	86.228
1999-01-01	86.465
1999-04-01	88.201
1999-07-01	94.970
1999-10-01	101.563
2000-01-01	106.337
2000-04-01	108.448
2000-07-01	108.518
2000-10-01	113.396
2001-01-01	113.878
2001-04-01	114.976
2001-07-01	127.047
2001-10-01	127.893
2002-01-01	133.291
2002-04-01	156.914
2002-07-01	158.886
2002-10-01	178.916
2003-01-01	195.923
2003-04-01	216.133
2003-07-01	232.776
2003-10-01	269.070
2004-01-01	283.024
2004-04-01	296.610
2004-07-01	315.795
2004-10-01	361.491
2005-01-01	379.251
2005-04-01	393.314
2005-07-01	400.600
2005-10-01	424.807
2006-01-01	460.362
2006-04-01	498.654
2006-07-01	520.283
2006-10-01	584.345
2007-01-01	616.426
2007-04-01	685.883
2007-07-01	712.490
2007-10-01	766.098
2008-01-01	836.999
2008-04-01	907.251
2008-07-01	847.830
2008-10-01	784.258
2009-01-01	720.852
2009-04-01	765.154
2009-07-01	802.219
2009-10-01	796.582
2010-01-01	781.004
2010-04-01	701.477
2010-07-01	786.901
2010-10-01	775.232
2011-01-01	879.420
2011-04-01	903.748
2011-07-01	816.247
2011-10-01	775.985
2012-01-01	793.854
2012-04-01	747.800
2012-07-01	765.459
2012-10-01	777.375
2013-01-01	759.089
2013-04-01	768.156
2013-07-01	784.995
2013-10-01	784.224
2014-01-01	794.600
2014-04-01	797.387
2014-07-01	747.496
2014-10-01	698.445
2015-01-01	634.784
2015-04-01	631.643