From Esportspedia - League of Legends Esports
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The Garena Premier League was established in 2012 and is currently in its second season. GPL was the first major professional League of Legends league in the world.
The Garena Premier League is a fully professional League of Legends league over all of the Southeast Asia region, with 16 teams from 5 countries/areas to determine which team is the best in the region.
2012: Starting with 6 teams
2013: Eight teams
2014: Twelve teams
2015: Twenty teams