Quarter	Billions of US Dollars
1989-10-01	0.650
1990-01-01	0.672
1990-04-01	0.709
1990-07-01	0.774
1990-10-01	1.239
1991-01-01	1.099
1991-04-01	1.029
1991-07-01	1.107
1991-10-01	1.477
1992-01-01	1.336
1992-04-01	1.453
1992-07-01	1.628
1992-10-01	4.962
1993-01-01	4.833
1993-04-01	4.786
1993-07-01	5.097
1993-10-01	7.627
1994-01-01	10.170
1994-04-01	9.215
1994-07-01	11.065
1994-10-01	9.697
1995-01-01	11.553
1995-04-01	12.346
1995-07-01	11.890
1995-10-01	12.282
1996-01-01	11.796
1996-04-01	12.248
1996-07-01	12.138
1996-10-01	10.891
1997-01-01	10.264
1997-04-01	9.797
1997-07-01	9.992
1997-10-01	9.722
1998-01-01	9.123
1998-04-01	9.423
1998-07-01	9.782
1998-10-01	9.335
1999-01-01	8.193
1999-04-01	8.123
1999-07-01	9.674
1999-10-01	10.671
2000-01-01	8.019
2000-04-01	8.646
2000-07-01	7.741
2000-10-01	8.214
2001-01-01	7.666
2001-04-01	6.712
2001-07-01	6.353
2001-10-01	6.864
2002-01-01	6.645
2002-04-01	7.423
2002-07-01	8.038
2002-10-01	8.945
2003-01-01	8.593
2003-04-01	9.048
2003-07-01	8.756
2003-10-01	8.649
2004-01-01	8.723
2004-04-01	8.448
2004-07-01	8.981
2004-10-01	10.616
2005-01-01	11.943
2005-04-01	10.949
2005-07-01	11.080
2005-10-01	11.724
2006-01-01	12.110
2006-04-01	12.081
2006-07-01	10.858
2006-10-01	10.314
2007-01-01	9.568
2007-04-01	8.813
2007-07-01	8.556
2007-10-01	8.046
2008-01-01	10.903
2008-04-01	9.384
2008-07-01	9.100
2008-10-01	10.030
2009-01-01	10.476
2009-04-01	10.273
2009-07-01	10.550
2009-10-01	6.744
2010-01-01	8.555
2010-04-01	9.592
2010-07-01	9.436
2010-10-01	9.768
2011-01-01	10.084
2011-04-01	10.837
2011-07-01	11.163
2011-10-01	11.286
2012-01-01	16.991
2012-04-01	14.837
2012-07-01	11.951
2012-10-01	15.334
2013-01-01	15.496
2013-04-01	13.703
2013-07-01	16.666
2013-10-01	13.345
2014-01-01	12.212
2014-04-01	12.524
2014-07-01	10.781
2014-10-01	9.787
2015-01-01	10.682