Question: What is the percentage of female competitors whose heights are over 170 that participated in the game in 1988?
SQL: SELECT CAST(COUNT(CASE WHEN T3.gender = 'F' AND T3.height > 170 THEN 1 END) AS REAL) * 100 / COUNT(T2.person_id) FROM games AS T1 INNER JOIN games_competitor AS T2 ON T1.id = T2.games_id INNER JOIN person AS T3 ON T2.person_id = T3.id WHERE T1.games_year = 1988