Indonesia's economy grew 5.21 per cent in the first quarter of this year, the slowest pace in more than four years, dpa quoted the Central Bureau of Statistics as saying Monday. Domestic consumption remained the main driver of the economy, growing by 5.61 per cent, the bureau said. South-east Asia's largest economy grew 5.78 per cent in 2013 after having expanded more than 6 per cent since 2010.