Calculate the percentage of complaints made by Google account client in server ZOHARI.
Google account refers to email like '%@gmail.com'; percentage = divide(count(Complaint ID where email like '%@gmail.com') , count(Complaint ID)) * 100%
SELECT CAST(SUM(CASE WHEN T1.email LIKE '%@gmail.com' THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(T1.email) FROM client AS T1 INNER JOIN callcenterlogs AS T2 ON T1.client_id = T2.`rand client` WHERE T2.server = 'ZOHARI'