Database: simpson_episodes
Question: How many recipients of the Primetime Emmy Award category that were born in the USA? Find the percentage of Americans in the total number of the country.
SQL: SELECT SUM(CASE WHEN T1.birth_country = 'USA' THEN 1 ELSE 0 END) AS num , CAST(SUM(CASE WHEN T1.birth_country = 'USA' THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(*) FROM Person AS T1 INNER JOIN Award AS T2 ON T1.name = T2.person WHERE T2.award_category = 'Primetime Emmy' AND T2.person = 'Dan Castellaneta';