Quarter	Billions of US Dollars
1987-01-01	9.564
1987-04-01	9.453
1987-07-01	9.201
1987-10-01	10.057
1988-01-01	9.695
1988-04-01	9.441
1988-07-01	9.865
1988-10-01	10.311
1989-01-01	10.341
1989-04-01	10.077
1989-07-01	10.625
1989-10-01	11.034
1990-01-01	11.161
1990-04-01	10.940
1990-07-01	11.788
1990-10-01	13.402
1991-01-01	12.031
1991-04-01	12.995
1991-07-01	14.000
1991-10-01	15.171
1992-01-01	14.973
1992-04-01	16.726
1992-07-01	17.950
1992-10-01	18.146
1993-01-01	19.806
1993-04-01	21.107
1993-07-01	31.261
1993-10-01	32.793
1994-01-01	37.319
1994-04-01	39.952
1994-07-01	42.305
1994-10-01	43.567
1995-01-01	44.230
1995-04-01	46.318
1995-07-01	47.238
1995-10-01	48.908
1996-01-01	52.417
1996-04-01	58.211
1996-07-01	58.702
1996-10-01	64.083
1997-01-01	67.411
1997-04-01	71.372
1997-07-01	76.151
1997-10-01	71.829
1998-01-01	72.131
1998-04-01	72.846
1998-07-01	69.505
1998-10-01	67.286
1999-01-01	63.876
1999-04-01	63.080
1999-07-01	62.466
1999-10-01	63.292
2000-01-01	65.011
2000-04-01	63.021
2000-07-01	61.017
2000-10-01	59.502
2001-01-01	57.523
2001-04-01	56.686
2001-07-01	51.533
2001-10-01	50.746
2002-01-01	49.170
2002-04-01	50.263
2002-07-01	49.357
2002-10-01	50.199
2003-01-01	52.662
2003-04-01	56.906
2003-07-01	59.352
2003-10-01	63.685
2004-01-01	69.140
2004-04-01	71.291
2004-07-01	75.011
2004-10-01	80.950
2005-01-01	85.672
2005-04-01	91.058
2005-07-01	94.938
2005-10-01	108.766
2006-01-01	117.283
2006-04-01	129.162
2006-07-01	139.389
2006-10-01	157.300
2007-01-01	180.753
2007-04-01	203.755
2007-07-01	207.331
2007-10-01	216.716
2008-01-01	229.161
2008-04-01	241.413
2008-07-01	235.236
2008-10-01	219.538
2009-01-01	211.267
2009-04-01	220.470
2009-07-01	226.114
2009-10-01	226.286
2010-01-01	234.357
2010-04-01	232.817
2010-07-01	259.231
2010-10-01	281.387
2011-01-01	302.108
2011-04-01	325.311
2011-07-01	324.390
2011-10-01	332.104
2012-01-01	370.424
2012-04-01	384.940
2012-07-01	437.994
2012-10-01	474.843
2013-01-01	505.355
2013-04-01	525.316
2013-07-01	551.241
2013-10-01	583.216
2014-01-01	614.285
2014-04-01	650.879
2014-07-01	669.520
2014-10-01	693.843
2015-01-01	684.354
2015-04-01	702.449