Quarter	Billions of US Dollars
1989-10-01	-3.613
1990-01-01	7.088
1990-04-01	3.286
1990-07-01	7.014
1990-10-01	-6.244
1991-01-01	10.745
1991-04-01	-0.230
1991-07-01	-0.426
1991-10-01	-1.042
1992-01-01	7.652
1992-04-01	-1.808
1992-07-01	-4.011
1992-10-01	-1.593
1993-01-01	-5.752
1993-04-01	3.354
1993-07-01	62.183
1993-10-01	0.671
1994-01-01	0.838
1994-04-01	3.215
1994-07-01	2.228
1994-10-01	-5.571
1995-01-01	-2.563
1995-04-01	2.840
1995-07-01	2.331
1995-10-01	1.924
1996-01-01	5.932
1996-04-01	10.982
1996-07-01	-2.363
1996-10-01	2.564
1997-01-01	8.338
1997-04-01	-2.158
1997-07-01	5.084
1997-10-01	-0.988
1998-01-01	6.395
1998-04-01	4.253
1998-07-01	9.622
1998-10-01	-0.280
1999-01-01	23.742
1999-04-01	-2.454
1999-07-01	15.913
1999-10-01	5.335
2000-01-01	5.232
2000-04-01	9.451
2000-07-01	17.094
2000-10-01	22.071
2001-01-01	22.341
2001-04-01	6.894
2001-07-01	-12.971
2001-10-01	4.512
2002-01-01	5.798
2002-04-01	-0.449
2002-07-01	17.968
2002-10-01	-1.041
2003-01-01	41.655
2003-04-01	10.591
2003-07-01	-22.630
2003-10-01	43.929
2004-01-01	2.493
2004-04-01	-1.805
2004-07-01	34.473
2004-10-01	14.824
2005-01-01	32.372
2005-04-01	18.981
2005-07-01	-8.521
2005-10-01	-4.464
2006-01-01	60.097
2006-04-01	26.080
2006-07-01	22.392
2006-10-01	14.206
2007-01-01	112.294
2007-04-01	52.430
2007-07-01	-62.696
2007-10-01	-83.513
2008-01-01	67.931
2008-04-01	3.970
2008-07-01	9.373
2008-10-01	-32.346
2009-01-01	-28.505
2009-04-01	-26.799
2009-07-01	15.890
2009-10-01	-85.832
2010-01-01	20.085
2010-04-01	-45.025
2010-07-01	-0.302
2010-10-01	-40.692
2011-01-01	28.471
2011-04-01	-2.622
2011-07-01	38.097
2011-10-01	7.982
2012-01-01	29.759
2012-04-01	-32.148
2012-07-01	-26.810
2012-10-01	-21.101
2013-01-01	14.904
2013-04-01	-3.959
2013-07-01	23.001
2013-10-01	-62.022
2014-01-01	27.325
2014-04-01	29.877
2014-07-01	19.592
2014-10-01	-8.178
2015-01-01	36.147
2015-04-01	-34.453