Database: ice_hockey_draft
Question: Calculate the percentage of penalty minutes of Swedish players in OHL league among all players.
SQL: SELECT CAST(COUNT(CASE WHEN T1.nation = 'Sweden' THEN T2.PIM ELSE NULL END) AS REAL) * 100 / COUNT(*) FROM PlayerInfo AS T1 INNER JOIN SeasonStatus AS T2 ON T1.ELITEID = T2.ELITEID WHERE T2.LEAGUE = 'OHL'