Quarter	Billions of US Dollars
1981-01-01	86.739
1981-04-01	87.355
1981-07-01	86.478
1981-10-01	90.290
1982-01-01	91.981
1982-04-01	95.173
1982-07-01	98.247
1982-10-01	104.049
1983-01-01	104.584
1983-04-01	107.710
1983-07-01	110.359
1983-10-01	111.014
1984-01-01	111.840
1984-04-01	112.431
1984-07-01	110.701
1984-10-01	111.279
1985-01-01	117.681
1985-04-01	122.157
1985-07-01	133.148
1985-10-01	138.136
1986-01-01	142.312
1986-04-01	148.072
1986-07-01	150.843
1986-10-01	153.465
1987-01-01	162.338
1987-04-01	170.897
1987-07-01	175.826
1987-10-01	188.807
1988-01-01	193.633
1988-04-01	186.324
1988-07-01	187.880
1988-10-01	189.843
1989-01-01	189.241
1989-04-01	187.843
1989-07-01	193.963
1989-10-01	199.113
1990-01-01	204.220
1990-04-01	209.210
1990-07-01	209.800
1990-10-01	215.459
1991-01-01	205.820
1991-04-01	201.372
1991-07-01	173.607
1991-10-01	182.170
1992-01-01	168.782
1992-04-01	176.935
1992-07-01	184.147
1992-10-01	186.586
1993-01-01	177.062
1993-04-01	183.425
1993-07-01	190.771
1993-10-01	198.276
1994-01-01	205.693
1994-04-01	212.636
1994-07-01	219.593
1994-10-01	226.501
1995-01-01	233.020
1995-04-01	240.568
1995-07-01	229.484
1995-10-01	228.003
1996-01-01	240.279
1996-04-01	239.176
1996-07-01	242.523
1996-10-01	247.980
1997-01-01	254.607
1997-04-01	263.801
1997-07-01	270.219
1997-10-01	257.028
1998-01-01	263.677
1998-04-01	255.126
1998-07-01	265.126
1998-10-01	274.747
1999-01-01	284.751
1999-04-01	290.927
1999-07-01	302.354
1999-10-01	315.295
2000-01-01	326.980
2000-04-01	329.174
2000-07-01	329.289
2000-10-01	334.137
2001-01-01	344.004
2001-04-01	354.387
2001-07-01	361.038
2001-10-01	371.883
2002-01-01	380.563
2002-04-01	392.417
2002-07-01	409.267
2002-10-01	425.439
2003-01-01	442.647
2003-04-01	466.949
2003-07-01	488.236
2003-10-01	504.324
2004-01-01	543.547
2004-04-01	530.635
2004-07-01	548.392
2004-10-01	594.960
2005-01-01	609.033
2005-04-01	626.556
2005-07-01	635.543
2005-10-01	634.355
2006-01-01	654.700
2006-04-01	651.053
2006-07-01	668.025
2006-10-01	709.196
2007-01-01	740.988
2007-04-01	809.972
2007-07-01	851.456
2007-10-01	883.776
2008-01-01	890.257
2008-04-01	859.216
2008-07-01	820.675
2008-10-01	813.073
2009-01-01	802.833
2009-04-01	877.660
2009-07-01	903.582
2009-10-01	955.514
2010-01-01	1018.735
2010-04-01	1013.418
2010-07-01	1078.542
2010-10-01	1112.046
2011-01-01	1145.298
2011-04-01	1186.709
2011-07-01	1122.318
2011-10-01	1071.468
2012-01-01	1155.083
2012-04-01	1089.932
2012-07-01	1183.540
2012-10-01	1171.387
2013-01-01	1219.982
2013-04-01	1153.516
2013-07-01	1127.034
2013-10-01	1180.428
2014-01-01	1257.801
2014-04-01	1283.519
2014-07-01	1279.509
2014-10-01	1283.229
2015-01-01	1327.500
2015-04-01	1347.347
2015-07-01	1348.340
2015-10-01	1377.906
2016-01-01	1416.819
2016-04-01	1425.112
2016-07-01	1479.466
2016-10-01	1486.034
2017-01-01	1591.155
2017-04-01	1647.338
2017-07-01	1679.221
2017-10-01	1765.728
2018-01-01	1777.840