Quarter	Billions of US Dollars
1989-07-01	0.561
1989-10-01	0.460
1990-01-01	0.753
1990-04-01	0.931
1990-07-01	2.484
1990-10-01	2.017
1991-01-01	2.947
1991-04-01	2.927
1991-07-01	2.647
1991-10-01	2.321
1992-01-01	3.205
1992-04-01	3.258
1992-07-01	2.969
1992-10-01	1.760
1993-01-01	2.873
1993-04-01	3.750
1993-07-01	3.981
1993-10-01	5.157
1994-01-01	5.667
1994-04-01	5.278
1994-07-01	5.162
1994-10-01	6.081
1995-01-01	6.347
1995-04-01	6.114
1995-07-01	7.599
1995-10-01	8.724
1996-01-01	9.964
1996-04-01	9.612
1996-07-01	8.428
1996-10-01	8.905
1997-01-01	10.779
1997-04-01	10.614
1997-07-01	10.739
1997-10-01	13.638
1998-01-01	14.780
1998-04-01	14.974
1998-07-01	16.426
1998-10-01	16.832
1999-01-01	17.063
1999-04-01	20.000
1999-07-01	22.929
1999-10-01	26.322
2000-01-01	27.766
2000-04-01	28.329
2000-07-01	29.156
2000-10-01	36.792
2001-01-01	37.505
2001-04-01	40.663
2001-07-01	37.345
2001-10-01	38.905
2002-01-01	41.147
2002-04-01	51.714
2002-07-01	52.994
2002-10-01	53.477
2003-01-01	60.451
2003-04-01	67.194
2003-07-01	64.209
2003-10-01	76.474
2004-01-01	79.319
2004-04-01	83.315
2004-07-01	84.478
2004-10-01	98.772
2005-01-01	99.775
2005-04-01	108.019
2005-07-01	114.228
2005-10-01	116.313
2006-01-01	128.834
2006-04-01	132.273
2006-07-01	133.010
2006-10-01	146.594
2007-01-01	160.510
2007-04-01	167.879
2007-07-01	147.966
2007-10-01	152.107
2008-01-01	170.383
2008-04-01	186.735
2008-07-01	136.194
2008-10-01	146.176
2009-01-01	136.617
2009-04-01	137.956
2009-07-01	125.823
2009-10-01	97.200
2010-01-01	97.559
2010-04-01	90.045
2010-07-01	107.140
2010-10-01	121.833
2011-01-01	144.191
2011-04-01	153.322
2011-07-01	144.702
2011-10-01	146.797
2012-01-01	170.277
2012-04-01	154.536
2012-07-01	148.957
2012-10-01	144.856
2013-01-01	153.409
2013-04-01	157.825
2013-07-01	161.687
2013-10-01	161.045
2014-01-01	159.238
2014-04-01	169.918
2014-07-01	163.865
2014-10-01	160.949
2015-01-01	155.431
2015-04-01	156.006