Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What was the tonnage on 30 march 1943?

### Inputs:
table_name: table, columns: ['Date', 'Ship', 'Nationality', 'Tonnage', 'Fate']

### Response:
SELECT AVG Tonnage FROM table WHERE Date = 30 march 1943