Quarter	Billions of US Dollars
1989-10-01	5.275
1990-01-01	5.251
1990-04-01	5.186
1990-07-01	5.198
1990-10-01	6.119
1991-01-01	5.839
1991-04-01	5.514
1991-07-01	5.447
1991-10-01	6.472
1992-01-01	6.405
1992-04-01	6.367
1992-07-01	6.380
1992-10-01	7.237
1993-01-01	6.979
1993-04-01	6.848
1993-07-01	6.231
1993-10-01	7.165
1994-01-01	7.762
1994-04-01	8.417
1994-07-01	8.704
1994-10-01	8.959
1995-01-01	9.232
1995-04-01	9.488
1995-07-01	9.857
1995-10-01	9.570
1996-01-01	9.981
1996-04-01	10.293
1996-07-01	10.263
1996-10-01	9.909
1997-01-01	10.361
1997-04-01	10.723
1997-07-01	10.954
1997-10-01	10.303
1998-01-01	10.530
1998-04-01	10.301
1998-07-01	10.805
1998-10-01	11.283
1999-01-01	11.732
1999-04-01	10.928
1999-07-01	11.268
1999-10-01	11.674
2000-01-01	12.086
2000-04-01	12.501
2000-07-01	11.465
2000-10-01	11.935
2001-01-01	11.738
2001-04-01	11.507
2001-07-01	10.791
2001-10-01	10.643
2002-01-01	10.026
2002-04-01	9.288
2002-07-01	9.249
2002-10-01	9.175
2003-01-01	9.115
2003-04-01	8.930
2003-07-01	9.031
2003-10-01	9.256
2004-01-01	9.325
2004-04-01	9.341
2004-07-01	9.834
2004-10-01	10.513
2005-01-01	10.791
2005-04-01	13.031
2005-07-01	14.284
2005-10-01	14.647
2006-01-01	15.110
2006-04-01	15.602
2006-07-01	16.206
2006-10-01	15.844
2007-01-01	17.898
2007-04-01	18.302
2007-07-01	19.512
2007-10-01	21.296
2008-01-01	22.438
2008-04-01	23.980
2008-07-01	23.190
2008-10-01	23.931
2009-01-01	23.912
2009-04-01	23.394
2009-07-01	23.689
2009-10-01	25.915
2010-01-01	27.320
2010-04-01	28.072
2010-07-01	30.054
2010-10-01	33.359
2011-01-01	33.453
2011-04-01	36.960
2011-07-01	38.192
2011-10-01	40.768
2012-01-01	43.294
2012-04-01	43.783
2012-07-01	45.717
2012-10-01	45.296
2013-01-01	48.507
2013-04-01	52.418
2013-07-01	54.777
2013-10-01	55.547
2014-01-01	55.313
2014-04-01	46.551
2014-07-01	45.013
2014-10-01	43.987
2015-01-01	45.456