Quarter	Billions of US Dollars
1987-01-01	2.748
1987-04-01	3.049
1987-07-01	3.345
1987-10-01	3.508
1988-01-01	3.286
1988-04-01	3.250
1988-07-01	3.218
1988-10-01	3.520
1989-01-01	3.454
1989-04-01	2.946
1989-07-01	3.402
1989-10-01	3.435
1990-01-01	3.700
1990-04-01	4.181
1990-07-01	4.981
1990-10-01	5.162
1991-01-01	4.809
1991-04-01	5.067
1991-07-01	6.097
1991-10-01	7.037
1992-01-01	7.354
1992-04-01	9.205
1992-07-01	10.744
1992-10-01	11.262
1993-01-01	13.499
1993-04-01	16.290
1993-07-01	18.987
1993-10-01	21.510
1994-01-01	26.045
1994-04-01	28.603
1994-07-01	34.982
1994-10-01	39.960
1995-01-01	46.258
1995-04-01	50.562
1995-07-01	56.087
1995-10-01	63.058
1996-01-01	69.624
1996-04-01	74.828
1996-07-01	79.863
1996-10-01	90.711
1997-01-01	98.631
1997-04-01	106.786
1997-07-01	111.694
1997-10-01	112.938
1998-01-01	123.825
1998-04-01	133.619
1998-07-01	144.305
1998-10-01	147.536
1999-01-01	154.907
1999-04-01	166.850
1999-07-01	197.597
1999-10-01	209.095
2000-01-01	214.857
2000-04-01	237.397
2000-07-01	234.815
2000-10-01	251.750
2001-01-01	261.110
2001-04-01	264.252
2001-07-01	292.334
2001-10-01	287.178
2002-01-01	297.766
2002-04-01	337.756
2002-07-01	347.657
2002-10-01	374.698
2003-01-01	408.383
2003-04-01	429.645
2003-07-01	445.803
2003-10-01	497.762
2004-01-01	531.264
2004-04-01	542.931
2004-07-01	583.108
2004-10-01	636.364
2005-01-01	628.450
2005-04-01	612.663
2005-07-01	616.186
2005-10-01	601.518
2006-01-01	631.641
2006-04-01	667.072
2006-07-01	671.544
2006-10-01	701.511
2007-01-01	738.946
2007-04-01	766.367
2007-07-01	802.681
2007-10-01	837.943
2008-01-01	887.277
2008-04-01	882.070
2008-07-01	779.004
2008-10-01	743.525
2009-01-01	653.153
2009-04-01	670.783
2009-07-01	670.053
2009-10-01	648.690
2010-01-01	614.313
2010-04-01	573.036
2010-07-01	613.991
2010-10-01	600.698
2011-01-01	640.487
2011-04-01	644.677
2011-07-01	623.535
2011-10-01	611.901
2012-01-01	635.808
2012-04-01	623.225
2012-07-01	622.782
2012-10-01	623.039
2013-01-01	592.045
2013-04-01	592.774
2013-07-01	596.244
2013-10-01	593.537
2014-01-01	595.426
2014-04-01	588.353
2014-07-01	559.873
2014-10-01	546.387
2015-01-01	512.988
2015-04-01	515.099