CAIRO- Average yields on Egypt's three-and nine-month treasury bills fell at an auction on Sunday, central bank data showed.

Yields on the 91-day bills fell to 18.919 percent from 19.257 at the last sale a week earlier, while yields on the 266-day bills slipped to 18.115 percent from 18.838 percent.

Appetite for Egypt's domestic debt has grown since the central bank floated the pound currency a year ago. Since then, the CBE has raised key interest rates by 700 basis points.

(Reporting by Nadine Awadalla; Editing by Gareth Jones) ((Nadine.Awadalla@thomsonreuters.com;))