A week ago, three-month bills were sold at an average rate of 7.32 percent.
A week ago, six-month bills were sold at an average rate of 7.30 percent.
A new one-year bill will be sold on Thursday.
The bills, which mature April 20, were sold at an average discount rate of 9.64 percent.
The six-month bill was sold at an average rate of 5 percent, down from 5.075 percent.
Late in the day it said the three-month bills were sold at an average yield of 5.82 percent.
The six-month bills were sold at an average yield of 6 percent.
The new bills were sold at an average discount rate of 5.89 percent.
The bills, which mature on April 26, were sold at an average discount rate of 7.95 percent.
At the auction, the new bills were both sold at an average rate of 5.16 percent.