2009 Indian general election
General elections were held in India in five phases between 16 April 2009 and 13 May 2009 to elect the members of the fifteenth Lok Sabha. With a registered electorate of 716 million and a turnout of 417 million voters, it was the largest democratic election in the world until being surpassed by the 2014 general election.
Source: Wikipedia — 2009 Indian general election (CC BY-SA 4.0)