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

### Instruction:
What year did maggs magnificent mild win a gold medal in the mild and porter category at the siba south east region beer competition?

### Inputs:
table_name: table, columns: ['Year', 'Beer Name', 'Prize', 'Category', 'Competition']

### Response:
SELECT AVG Year FROM table WHERE Beer Name = maggs magnificent mild AND Prize = gold medal AND Category = mild and porter AND Competition = siba south east region beer competition