JAKARTA Indonesia's economy grew 5.17% on an annual basis in the second quarter, the fastest pace in three quarters and beating market expectations, official data showed on Monday.

A Reuters poll had expected gross domestic product (GDP) to expand 4.93% in the April-June quarter compared with the same period a year earlier. Growth was 5.04% in the first quarter.

On a quarterly, non-seasonally adjusted basis, GDP expanded 3.86%, compared with the poll's prediction of a 3.72% growth.

(Reporting by Stefanno Sulaiman, Fransiska Nangoy and Gayatri Suroyo; Editing by Martin Petty)