Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_21 (tonnage INTEGER, date_entered_service VARCHAR)
### Question:
what is the least tonnage for the ship(s) that entered service on 11 february 1983?
### Answer:
SELECT MIN(tonnage) FROM table_name_21 WHERE date_entered_service = "11 february 1983"