Write SQL query to solve given problem: Among the universities in Australia, how many of them have a student staff ratio of over 15 in 2011?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(*) 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 T3.country_name = 'Australia' AND T2.student_staff_ratio > 15 AND T2.year = 2011