Write SQL query to solve given problem: What is the percentage of Swedish players in playoffs games in the 1997 - 2000 season?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT DISTINCT CAST(COUNT(CASE WHEN T1.nation = 'Sweden' THEN T1.ELITEID ELSE NULL END) OVER (PARTITION BY T2.SEASON) AS REAL) * 100 / COUNT(T1.ELITEID) OVER (PARTITION BY T2.SEASON) FROM PlayerInfo AS T1 INNER JOIN SeasonStatus AS T2 ON T1.ELITEID = T2.ELITEID WHERE T2.SEASON IN ('1997-1998', '1998-1999', '1999-2000')