How many episodes aired in the year 2009 have over 15% of voters giving 10 stars in star score?
aired in the year 2009 refers to air_date like '2009%'; 10 stars in star score refers to stars = 10; over 15% of voters refers to Votes.percent > 15
SELECT COUNT(*) FROM Episode AS T1 INNER JOIN Vote AS T2 ON T2.episode_id = T1.episode_id WHERE SUBSTR(T1.air_date, 1, 4) = '2009' AND T2.stars = 10 AND T2.percent > 15;