Find the difference in percentage of the movies under keywords of "woman director" and "independent film".
under keywords of "woman director" and "independent film" refers to keyword_name = 'woman director' and keyword_name = 'independent film'; difference in percentage = divide(subtract(count(movie_id) when keyword_name = 'woman director', count(movie_id) when keyword_name = 'independent film'), count(movie_id)) as percentage
SELECT CAST((SUM(CASE WHEN T1.keyword_name = 'woman director' THEN 1 ELSE 0 END) - SUM(CASE WHEN T1.keyword_name = 'independent film' THEN 1 ELSE 0 END)) AS REAL) * 100 / SUM(CASE WHEN T1.keyword_name = 'independent film' THEN 1 ELSE 0 END) FROM keyword AS T1 INNER JOIN movie_keywords AS T2 ON T1.keyword_id = T2.keyword_id