Between 2011 to 2016, in which countries can you find the universities where at least 50% of its students are international students?
Between 2011 to 2016 refers to year BETWEEN 2011 AND 2016; at least 50% of its students are international students refers to pct_international_students > 50; which country refers to country_name
SELECT DISTINCT T3.country_name FROM university AS T1 INNER JOIN university_year AS T2 ON T1.id = T2.university_id INNER JOIN country AS T3 ON T3.id = T1.country_id WHERE T2.pct_international_students > 50 AND T2.year BETWEEN 2011 AND 2016