Quarter	Billions of US Dollars
1998-07-01	0.18484
1998-10-01	0.21626
1999-01-01	0.20764
1999-04-01	0.20644
2000-10-01	0.18000
2001-01-01	0.18000
2001-04-01	0.18000
2001-07-01	0.18000
2005-07-01	0.14450
2005-10-01	0.14156
2006-01-01	0.14525
2006-04-01	0.15256