What is the average tonnage of the ship named proletarij?
CREATE TABLE table_name_81 (
    tonnage INTEGER,
    name_of_ship VARCHAR
)
SELECT AVG(tonnage) FROM table_name_81 WHERE name_of_ship = "proletarij"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the average tonnage of the ship named proletarij? ### Input: CREATE TABLE table_name_81 (
    tonnage INTEGER,
    name_of_ship VARCHAR
) ### Response: SELECT AVG(tonnage) FROM table_name_81 WHERE name_of_ship = "proletarij"