Quarter	Billions of US Dollars
1987-01-01	0.3602
1987-04-01	0.3579
1987-07-01	0.3583
1987-10-01	0.3930
1988-01-01	0.3858
1988-04-01	0.3712
1988-07-01	0.3646
1988-10-01	0.3770
1989-01-01	0.4831
1989-04-01	0.4747
1989-07-01	0.4813
1989-10-01	0.4838
1990-01-01	0.5429
1990-04-01	0.5526
1990-07-01	0.5784
1990-10-01	0.6895
1991-01-01	0.6688
1991-04-01	0.8157
1991-07-01	1.0440
1991-10-01	1.0606
1992-01-01	1.0403
1992-04-01	1.1505
1992-07-01	1.1736
1992-10-01	1.2069
1993-01-01	1.2374
1993-04-01	1.2711
1993-07-01	1.4298
1993-10-01	2.0948
1994-01-01	2.5582
1994-04-01	2.6891
1994-07-01	2.8122
1994-10-01	5.0068
1995-01-01	4.9771
1995-04-01	5.1744
1995-07-01	5.0641
1995-10-01	4.8782
1996-01-01	4.5990
1996-04-01	4.5949
1996-07-01	5.3271
1996-10-01	6.4267
1997-01-01	6.7613
1997-04-01	8.2036
1997-07-01	8.4853
1997-10-01	8.0282
1998-01-01	8.0968
1998-04-01	8.6802
1998-07-01	8.4677
1998-10-01	7.7864
1999-01-01	7.7606
1999-04-01	7.6147
1999-07-01	7.4225
1999-10-01	6.9336
2000-01-01	6.8204
2000-04-01	6.7809
2000-07-01	7.1616
2000-10-01	8.0838
2001-01-01	8.4696
2001-04-01	8.5146
2001-07-01	7.9656
2001-10-01	6.2304
2002-01-01	6.7395
2002-04-01	6.4513
2002-07-01	6.1082
2002-10-01	6.3820
2003-01-01	6.2619
2003-04-01	6.1080
2003-07-01	6.3784
2003-10-01	6.4950
2004-01-01	6.6552
2004-04-01	6.3092
2004-07-01	6.3739
2004-10-01	6.9992
2005-01-01	7.7931
2005-04-01	7.6425
2005-07-01	7.5560
2005-10-01	6.5533
2006-01-01	5.8151
2006-04-01	5.9899
2006-07-01	5.8626
2006-10-01	6.3905
2007-01-01	5.8915
2007-04-01	7.5506
2007-07-01	7.8298
2007-10-01	8.5462
2008-01-01	9.2372
2008-04-01	9.6737
2008-07-01	11.7422
2008-10-01	11.3904
2009-01-01	11.4694
2009-04-01	12.0656
2009-07-01	13.7475
2009-10-01	13.7685
2010-01-01	14.2034
2010-04-01	14.6347
2010-07-01	16.5157
2010-10-01	17.7651
2011-01-01	19.7300
2011-04-01	25.9493
2011-07-01	28.6233
2011-10-01	29.5270
2012-01-01	36.2465
2012-04-01	38.4530
2012-07-01	40.6979
2012-10-01	42.7597
2013-01-01	47.1523
2013-04-01	52.5333
2013-07-01	55.8754
2013-10-01	56.6023
2014-01-01	61.6998
2014-04-01	64.5284
2014-07-01	71.3227
2014-10-01	71.2475
2015-01-01	73.1236
2015-04-01	76.7361