Question: For the word "grec", what is the percentage of the appearances in the "Art" Wikipedia page have among all the appearances?
SQL: SELECT CAST(SUM(CASE WHEN T3.title = 'Art' THEN T2.occurrences ELSE 0 END) AS REAL) * 100 / SUM(T2.occurrences) FROM words AS T1 INNER JOIN pages_words AS T2 ON T1.wid = T2.wid INNER JOIN pages AS T3 ON T2.pid = T3.pid WHERE T1.word = 'grec'