Quarter	Billions of US Dollars
1989-10-01	1.029
1990-01-01	0.952
1990-04-01	0.889
1990-07-01	0.835
1990-10-01	0.785
1991-01-01	0.746
1991-04-01	0.710
1991-07-01	0.669
1991-10-01	0.671
1992-01-01	0.647
1992-04-01	0.625
1992-07-01	0.604
1992-10-01	1.408
1993-01-01	1.366
1993-04-01	1.325
1993-07-01	1.285
1993-10-01	2.502
1994-01-01	3.022
1994-04-01	3.253
1994-07-01	3.387
1994-10-01	3.656
1995-01-01	3.943
1995-04-01	4.431
1995-07-01	4.458
1995-10-01	4.830
1996-01-01	4.942
1996-04-01	5.227
1996-07-01	5.856
1996-10-01	6.380
1997-01-01	6.763
1997-04-01	7.262
1997-07-01	6.959
1997-10-01	7.287
1998-01-01	7.387
1998-04-01	7.804
1998-07-01	7.225
1998-10-01	7.861
1999-01-01	9.040
1999-04-01	9.164
1999-07-01	8.866
1999-10-01	11.860
2000-01-01	12.830
2000-04-01	13.022
2000-07-01	13.867
2000-10-01	15.312
2001-01-01	15.455
2001-04-01	16.444
2001-07-01	17.230
2001-10-01	18.394
2002-01-01	20.291
2002-04-01	20.749
2002-07-01	18.016
2002-10-01	18.269
2003-01-01	18.521
2003-04-01	20.210
2003-07-01	20.116
2003-10-01	21.645
2004-01-01	24.749
2004-04-01	24.497
2004-07-01	27.105
2004-10-01	30.152
2005-01-01	33.449
2005-04-01	36.279
2005-07-01	37.908
2005-10-01	40.262
2006-01-01	42.610
2006-04-01	37.270
2006-07-01	40.342
2006-10-01	44.221
2007-01-01	45.725
2007-04-01	53.547
2007-07-01	53.029
2007-10-01	52.236
2008-01-01	60.581
2008-04-01	60.791
2008-07-01	51.362
2008-10-01	51.770
2009-01-01	47.410
2009-04-01	56.818
2009-07-01	64.440
2009-10-01	61.401
2010-01-01	68.273
2010-04-01	71.657
2010-07-01	78.346
2010-10-01	72.160
2011-01-01	79.747
2011-04-01	83.501
2011-07-01	80.295
2011-10-01	80.563
2012-01-01	89.659
2012-04-01	88.499
2012-07-01	89.024
2012-10-01	90.578
2013-01-01	90.314
2013-04-01	87.501
2013-07-01	94.668
2013-10-01	94.983
2014-01-01	98.344
2014-04-01	103.650
2014-07-01	99.696
2014-10-01	82.631
2015-01-01	76.742