Quarter	Billions of US Dollars
1993-07-01	5.948
1993-10-01	8.506
1994-01-01	13.935
1994-04-01	4.907
1994-07-01	7.084
1994-10-01	7.036
1995-01-01	4.622
1995-04-01	7.018
1995-07-01	9.270
1995-10-01	4.382
1996-01-01	15.440
1996-04-01	16.174
1996-07-01	23.888
1996-10-01	27.198
1997-01-01	17.971
1997-04-01	19.515
1997-07-01	18.502
1997-10-01	21.710
1998-01-01	20.623
1998-04-01	29.347
1998-07-01	20.729
1998-10-01	0.078
1999-01-01	19.956
1999-04-01	21.510
1999-07-01	14.779
1999-10-01	7.503
2000-01-01	22.351
2000-04-01	31.029
2000-07-01	4.735
2000-10-01	28.135
2001-01-01	26.933
2001-04-01	21.347
2001-07-01	22.703
2001-10-01	1.859
2002-01-01	11.328
2002-04-01	10.964
2002-07-01	-0.302
2002-10-01	-5.536
2003-01-01	16.747
2003-04-01	5.838
2003-07-01	21.599
2003-10-01	15.208
2004-01-01	30.755
2004-04-01	33.549
2004-07-01	3.053
2004-10-01	15.348
2005-01-01	0.534
2005-04-01	15.452
2005-07-01	-8.304
2005-10-01	64.623
2006-01-01	33.421
2006-04-01	98.576
2006-07-01	76.659
2006-10-01	141.719
2007-01-01	104.340
2007-04-01	131.192
2007-07-01	43.841
2007-10-01	-7.994
2008-01-01	31.529
2008-04-01	-1.749
2008-07-01	-2.245
2008-10-01	12.086
2009-01-01	-12.430
2009-04-01	28.767
2009-07-01	-8.408
2009-10-01	-0.152
2010-01-01	-0.035
2010-04-01	-14.657
2010-07-01	-6.383
2010-10-01	-17.987
2011-01-01	5.568
2011-04-01	1.555
2011-07-01	-26.145
2011-10-01	7.115
2012-01-01	-21.815
2012-04-01	-14.217
2012-07-01	-16.009
2012-10-01	3.717
2013-01-01	30.662
2013-04-01	7.827
2013-07-01	36.205
2013-10-01	31.756
2014-01-01	-8.907
2014-04-01	32.600
2014-07-01	13.010
2014-10-01	-12.903
2015-01-01	3.284
2015-04-01	-3.968