Quarter	Billions of US Dollars
1972-10-01	0.02000
1973-04-01	0.02150
1975-10-01	0.03000
1977-01-01	0.03000
1977-04-01	0.05100
1978-01-01	0.04320
1978-07-01	0.02540
1980-10-01	-0.02000
1981-10-01	-0.03000
1984-01-01	-0.03000
1984-07-01	-0.01713
1985-04-01	-0.01944
1985-10-01	-0.02322
1987-07-01	-0.03262
1988-01-01	-0.07813
2002-07-01	0.60833
2002-10-01	0.37794
2007-07-01	-0.85891
2008-04-01	-0.58569