New Delhi: The Indian economy grew 8.4% in 2010-11, marginally lower than the previous estimate of 8.5%, on the back of strong farm sector and services sector growth, data showed on Tuesday. The Central Statistics Office (CSO) released the quick estimates of national income, which showed that the farm sector grew 7% in 2010-11, while the services sector, which accounts for more than 52% of the economy, rose 9.3%.