Among all superheroes created by George Lucas, identify the percentage of female superheroes.
created by George Lucas refers to publisher_name = 'George Lucas'; percentage = MULTIPLY(DIVIDE(SUM(gender = 'Female' WHERE publisher_name = 'George Lucas'), COUNT(publisher_name = 'George Lucas')), 100.0); female refers to gender = 'Female';
SELECT CAST(COUNT(CASE WHEN T3.gender = 'Female' THEN 1 ELSE NULL END) AS REAL) * 100 / COUNT(T1.id) FROM superhero AS T1 INNER JOIN publisher AS T2 ON T1.publisher_id = T2.id INNER JOIN gender AS T3 ON T1.gender_id = T3.id WHERE T2.publisher_name = 'George Lucas'