TUNIS, Oct 5 (Reuters) - Tunisia's annual inflation rate eased to 5% in September down from 5.2% in August, the National Statistics Institute said on Sunday, the lowest level since 2021. In July, inflation was at 5.3%. The continued downward trend in inflation raised expectations that the central bank may cut its key interest rate at its policy meeting later this month. (Reporting by Tarek Amara Editing by Ros Russell) (The article has been published through a syndicated feed. Except for the headline, the content has been published verbatim. Liability lies with original publisher.)