Quarter	Billions of US Dollars
1987-10-01	-0.02133
1988-01-01	0.15220
1988-04-01	0.06470
1988-10-01	-0.03108
1989-07-01	0.07940
1990-04-01	-0.08372
1993-01-01	-0.06611
1994-01-01	-0.08700
1994-07-01	-0.09602
1995-04-01	-0.09475
2012-10-01	0.27500
2013-10-01	0.05000
2014-04-01	0.50043