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