Greece's economy grew by 0.9 percent in the second quarter, official date showed Friday, improving on the 0.8 percent figure reported in a flash estimate earlier in August.

"Seasonally adjusted data indicate that in the second quarter of 2015 (output) increased by 0.9 percent compared with the first quarter of 2015 against the increase of 0.8 percent that was calculated for the flash estimate," the state statistics agency said, as the country headed for early elections next month.