What is the ID of the university that has only 1% of international students between 2011 to 2015?
has only 1% of international students refers to pct_international_students = 1; between 2011 to 2015 refers to year BETWEEN 2011 AND 2015; ID of university refers to university_id
SELECT university_id FROM university_year WHERE pct_international_students = 1 AND year BETWEEN 2011 AND 2015