Quarter	Billions of US Dollars
1989-10-01	1.003
1990-01-01	0.961
1990-04-01	1.128
1990-07-01	1.185
1990-10-01	1.187
1991-01-01	1.511
1991-04-01	1.671
1991-07-01	1.888
1991-10-01	2.128
1992-01-01	2.361
1992-04-01	2.578
1992-07-01	3.102
1992-10-01	3.003
1993-01-01	2.877
1993-04-01	2.828
1993-07-01	2.954
1993-10-01	3.103
1994-01-01	3.218
1994-04-01	3.254
1994-07-01	3.060
1994-10-01	3.423
1995-01-01	3.601
1995-04-01	4.146
1995-07-01	4.076
1995-10-01	4.066
1996-01-01	4.332
1996-04-01	4.249
1996-07-01	4.474
1996-10-01	4.279
1997-01-01	4.553
1997-04-01	4.559
1997-07-01	4.374
1997-10-01	4.130
1998-01-01	4.788
1998-04-01	4.693
1998-07-01	4.831
1998-10-01	5.143
1999-01-01	5.115
1999-04-01	5.784
1999-07-01	5.850
1999-10-01	7.299
2000-01-01	6.818
2000-04-01	7.413
2000-07-01	7.312
2000-10-01	7.727
2001-01-01	7.626
2001-04-01	7.882
2001-07-01	8.328
2001-10-01	7.915
2002-01-01	8.114
2002-04-01	8.813
2002-07-01	8.976
2002-10-01	9.646
2003-01-01	9.600
2003-04-01	9.820
2003-07-01	9.777
2003-10-01	10.113
2004-01-01	10.721
2004-04-01	11.187
2004-07-01	11.356
2004-10-01	12.364
2005-01-01	12.789
2005-04-01	13.249
2005-07-01	13.202
2005-10-01	12.799
2006-01-01	13.162
2006-04-01	14.911
2006-07-01	16.195
2006-10-01	16.823
2007-01-01	18.719
2007-04-01	19.444
2007-07-01	20.055
2007-10-01	22.828
2008-01-01	25.582
2008-04-01	28.643
2008-07-01	23.474
2008-10-01	24.944
2009-01-01	27.182
2009-04-01	31.729
2009-07-01	34.863
2009-10-01	37.124
2010-01-01	36.855
2010-04-01	37.893
2010-07-01	41.366
2010-10-01	44.350
2011-01-01	45.890
2011-04-01	47.104
2011-07-01	44.528
2011-10-01	45.437
2012-01-01	47.089
2012-04-01	46.793
2012-07-01	47.821
2012-10-01	49.040
2013-01-01	48.247
2013-04-01	40.784
2013-07-01	35.317
2013-10-01	30.665
2014-01-01	17.453
2014-04-01	6.405
2014-07-01	6.285
2014-10-01	6.055
2015-01-01	5.812