Question: What is the percentage of games that were released on PS4 in 2014 among all platforms?
SQL: SELECT CAST(COUNT(CASE WHEN T2.platform_name = 'PS4' THEN T3.game_id ELSE NULL END) AS REAL) * 100 / COUNT(T3.game_id) FROM game_platform AS T1 INNER JOIN platform AS T2 ON T1.platform_id = T2.id INNER JOIN game_publisher AS T3 ON T1.game_publisher_id = T3.id WHERE T1.release_year = 2014