What was the tonnage on 30 march 1943?
CREATE TABLE table_name_78 (tonnage INTEGER, date VARCHAR)
SELECT AVG(tonnage) FROM table_name_78 WHERE date = "30 march 1943"
### Context: CREATE TABLE table_name_78 (tonnage INTEGER, date VARCHAR) ### Question: What was the tonnage on 30 march 1943? ### Answer: SELECT AVG(tonnage) FROM table_name_78 WHERE date = "30 march 1943"