Quarter	Billions of US Dollars
1993-10-01	0.01050
1994-10-01	-0.01050
1996-04-01	0.11500
1996-07-01	-0.06500
1996-10-01	-0.02000
1997-01-01	0.00115
1997-04-01	-0.02000
1997-07-01	-0.01146
1998-01-01	0.01000
1998-04-01	-0.01000
2012-04-01	0.01586
2012-07-01	0.08361
2012-10-01	-0.03494
2013-01-01	0.19291
2013-04-01	0.17102
2013-07-01	0.34093
2013-10-01	0.26852
2014-01-01	0.50402
2014-04-01	0.14132
2014-07-01	0.24097
2014-10-01	0.04623
2015-01-01	0.20578
2015-04-01	-0.03674