Quarter	Billions of US Dollars
1989-10-01	21.912
1990-01-01	21.705
1990-04-01	21.082
1990-07-01	21.000
1990-10-01	23.847
1991-01-01	23.543
1991-04-01	23.864
1991-07-01	24.437
1991-10-01	29.772
1992-01-01	30.052
1992-04-01	31.098
1992-07-01	30.433
1992-10-01	37.025
1993-01-01	36.022
1993-04-01	35.640
1993-07-01	34.941
1993-10-01	39.201
1994-01-01	40.973
1994-04-01	41.540
1994-07-01	43.851
1994-10-01	45.040
1995-01-01	47.685
1995-04-01	50.156
1995-07-01	49.916
1995-10-01	51.555
1996-01-01	52.176
1996-04-01	57.892
1996-07-01	61.282
1996-10-01	63.597
1997-01-01	64.895
1997-04-01	63.555
1997-07-01	62.391
1997-10-01	62.263
1998-01-01	67.372
1998-04-01	66.663
1998-07-01	73.051
1998-10-01	73.938
1999-01-01	69.777
1999-04-01	65.842
1999-07-01	62.660
1999-10-01	64.776
2000-01-01	68.002
2000-04-01	64.206
2000-07-01	59.481
2000-10-01	54.417
2001-01-01	55.323
2001-04-01	49.411
2001-07-01	46.549
2001-10-01	42.507
2002-01-01	43.687
2002-04-01	42.645
2002-07-01	38.389
2002-10-01	37.737
2003-01-01	37.340
2003-04-01	34.495
2003-07-01	34.396
2003-10-01	35.139
2004-01-01	38.419
2004-04-01	37.092
2004-07-01	36.455
2004-10-01	41.477
2005-01-01	39.993
2005-04-01	39.365
2005-07-01	34.790
2005-10-01	35.613
2006-01-01	38.089
2006-04-01	37.815
2006-07-01	34.151
2006-10-01	33.519
2007-01-01	33.559
2007-04-01	30.971
2007-07-01	29.782
2007-10-01	28.531
2008-01-01	34.429
2008-04-01	35.173
2008-07-01	31.331
2008-10-01	29.604
2009-01-01	33.282
2009-04-01	32.666
2009-07-01	30.285
2009-10-01	32.646
2010-01-01	37.585
2010-04-01	35.374
2010-07-01	34.515
2010-10-01	40.064
2011-01-01	41.092
2011-04-01	38.235
2011-07-01	36.333
2011-10-01	39.400
2012-01-01	44.241
2012-04-01	44.531
2012-07-01	46.523
2012-10-01	50.051
2013-01-01	54.417
2013-04-01	52.777
2013-07-01	55.521
2013-10-01	55.321
2014-01-01	57.447
2014-04-01	57.212
2014-07-01	54.589
2014-10-01	51.938
2015-01-01	56.985