The issues were heavily over-subscribed and the treasury ended up issuing twice the planned amount, the Finance Ministry said.

The nominal annual interest rates are significantly lower than in a similar issue a month ago.

Three-month bills were sold at 0.25%, the same as in the previous month, while the yield on the six-month bills, at 0.58%, is 17 basis points lower and the yield on 12-month bills, at 0.99%, 46 basis points lower.

The issues come just a week after the yield on Slovenia's benchmark ten-year bond dropped below 4% for the first time since the end of 2010. Yesterday it stood at 3.89%, according to data on the electronic exchange MTS.