Quarter	Billions of US Dollars
1996-01-01	0.35792
1996-07-01	0.02795
1997-01-01	0.11084
1997-04-01	0.39023
1997-07-01	0.66761
1997-10-01	0.03630
1998-01-01	-0.17171
1998-04-01	-0.35649
1998-07-01	-0.27375
1998-10-01	-0.12978
1999-01-01	-0.12325
1999-07-01	-0.04920
1999-10-01	0.11427
2000-01-01	-0.06347
2000-04-01	-0.02916
2000-07-01	-0.02857
2000-10-01	-0.09212
2005-07-01	0.01937
2005-10-01	0.36414
2006-01-01	-0.00384
2006-07-01	-0.01759
2006-10-01	-0.09090
2007-04-01	0.07052
2008-01-01	0.06912
2008-04-01	-0.00269
2008-07-01	0.27850
2008-10-01	-0.13684
2009-01-01	-0.00059
2009-04-01	-0.00064
2009-07-01	-0.08472
2009-10-01	-0.15588
2010-01-01	-0.01862
2010-04-01	0.03573
2010-07-01	-0.11232
2010-10-01	0.04636
2011-01-01	0.00007
2011-04-01	-0.03227
2011-07-01	-0.00497
2011-10-01	-0.03089
2012-04-01	-0.08160
2013-01-01	0.09618
2013-04-01	0.06723
2013-07-01	0.09902
2013-10-01	0.02459
2014-01-01	0.05104
2014-04-01	-0.03794
2014-07-01	-0.10342
2014-10-01	0.04460
2015-01-01	-0.00341
2015-04-01	-0.02918