Calculate the average score of Emory University from 2011 to 2016.
average score refers to avg(score); Emory University refers to university_name = 'Emory University'; from 2011 to 2016 refers to year BETWEEN 2011 AND 2016;
SELECT AVG(T1.score) FROM university_ranking_year AS T1 INNER JOIN university AS T2 ON T1.university_id = T2.id WHERE T2.university_name = 'Emory University' AND T1.year BETWEEN 2011 AND 2016