Database: european_football_2
Question: What is the percentage of players that are under 180 cm who have an overall strength of more than 70?
SQL: SELECT CAST(COUNT(CASE WHEN t2.overall_rating > 70 THEN t1.id ELSE NULL END) AS REAL) * 100 / COUNT(t1.id) percent FROM Player AS t1 INNER JOIN Player_Attributes AS t2 ON t1.player_api_id = t2.player_api_id WHERE t1.height < 180