May 18 (Reuters) - Average yields on Egypt's six-month and one-year treasury bills rose at auction on Thursday, data from the central bank showed.

The average yield on the 182-day bills rose to 19.814 percent from 19.417 percent at the previous auction.

The yield on the 357-day bills increased to 19.698 percent from 19.307 percent previously.

(Reporting by Nadine Awadalla) ((Nadine.Awadalla@thomsonreuters.com;))