The 2013 tournament had a grand prize of $1 million and attracted 32 million viewers online. The 2014 and 2015 tournaments each gave out one of the largest total prize pools in esports history, at $2.3 million. The 2016 World Championship's total prize pool was over $5 million, with over $2 million going over to the winner of the tournament. In October 2015, SK Telecom T1 became the first-ever two-time World Champion when they defeated fellow Korean team KOO Tigers with a score of 3 to 1 in the best-of-five finals in Berlin, Germany. SK Telecom T1 repeated their feat in October 2016, defeating fellow Korean team Samsung Galaxy 3–2 in the 2016 World Championship. The 2016 tournament was also notable for introducing "Fan contributions" to the prize pool; a certain percentage of purchases from Riot's store over the preceding months of the tournament went to increasing the prizes for the 16 competing teams in the tournament.