The ship SSBergensfjord built before 1973 has what tonnage?
CREATE TABLE table_name_90 (
    tonnage VARCHAR,
    built VARCHAR,
    ship VARCHAR
)
SELECT tonnage FROM table_name_90 WHERE built < 1973 AND ship = "ssbergensfjord"
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: The ship SSBergensfjord built before 1973 has what tonnage? ### Input: CREATE TABLE table_name_90 (
    tonnage VARCHAR,
    built VARCHAR,
    ship VARCHAR
) ### Response: SELECT tonnage FROM table_name_90 WHERE built < 1973 AND ship = "ssbergensfjord"